Annual report pursuant to Section 13 and 15(d)

Stock Compensation (Narrative) (Details)

v3.20.4
Stock Compensation (Narrative) (Details) - USD ($)
$ in Thousands
1 Months Ended 3 Months Ended 6 Months Ended 12 Months Ended
Mar. 31, 2020
Apr. 30, 2019
Dec. 31, 2020
Dec. 31, 2019
Jun. 30, 2019
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Proceeds from the exercise of stock options           $ 258 $ 969 $ 3,010
Stock Options and Restricted Stock Units [Member] | President and CEO [Member]                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Compensation expense           $ 1,700    
Stock Options [Member]                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Expiration period           10 years    
Unamortized compensation expense     $ 1,000     $ 1,000    
Weighted average recognized period of unamortized compensation expenses (in years)           3 years 4 months 24 days    
Options exercised           4,136 15,585 44,994
Restricted Stock Units (RSUs) Granted Prior To 2016 [Member]                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Vesting period           6 years    
Restricted Stock Units (RSUs) Granted Prior To 2016 [Member] | Year Two [Member]                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Vesting percentage           20.00%    
Restricted Stock Units (RSUs) Granted Prior To 2016 [Member] | Year Three [Member]                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Vesting percentage           20.00%    
Restricted Stock Units (RSUs) Granted Prior To 2016 [Member] | Year Four [Member]                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Vesting percentage           20.00%    
Restricted Stock Units (RSUs) Granted Prior To 2016 [Member] | Year Five [Member]                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Vesting percentage           20.00%    
Restricted Stock Units (RSUs) Granted Prior To 2016 [Member] | Year Six [Member]                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Vesting percentage           20.00%    
Restricted Stock Units (RSUs) [Member]                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Unamortized compensation expense     $ 7,800     $ 7,800    
Weighted average recognized period of unamortized compensation expenses (in years)           3 years 4 months 24 days    
Vesting period           5 years    
Stock units granted           46,036 6,400 194,450
Restricted Stock Units (RSUs) [Member] | Year One [Member]                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Vesting percentage           20.00%    
Restricted Stock Units (RSUs) [Member] | Year Two [Member]                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Vesting percentage           20.00%    
Restricted Stock Units (RSUs) [Member] | Year Three [Member]                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Vesting percentage           20.00%    
Restricted Stock Units (RSUs) [Member] | Year Four [Member]                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Vesting percentage           20.00%    
Restricted Stock Units (RSUs) [Member] | Year Five [Member]                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Vesting percentage           20.00%    
Restricted Stock Units (RSUs) [Member] | Regional and Divisional Vice Presidents [Member]                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Stock units granted     18,286     18,286    
Restricted Stock Units (RSUs) [Member] | Interim President and Chief Executive Officer and Chief Operating Officer [Member]                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Stock units granted     20,000     20,000    
Retirement Plan for Non-Employee Directors [Member] | Restricted Stock Units (RSUs) [Member] | Director [Member]                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Issuance of common stock in connection with stock-based compensation, shares   8,000       0   0
Compensation expense           $ 800 $ 1,500 $ 200
Aggregate fair value of the shares issued   $ 1,200            
Minimum [Member] | 2020 Incentive Program [Member] | Restricted Stock Units (RSUs) [Member]                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Possible target award adjustment based on strategic and operational accomplishments 75.00%              
Maximum [Member] | 2020 Incentive Program [Member] | Restricted Stock Units (RSUs) [Member]                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Possible target award adjustment based on strategic and operational accomplishments 125.00%              
Maximum [Member] | Retirement Plan for Non-Employee Directors [Member] | Restricted Stock Units (RSUs) [Member] | Director [Member]                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Issuance of common stock in connection with stock-based compensation, shares       10,000 8,000