Quarterly report pursuant to Section 13 or 15(d)

Stock Compensation (Narrative) (Details)

v3.19.3
Stock Compensation (Narrative) (Details)
1 Months Ended 3 Months Ended 6 Months Ended 9 Months Ended
Jul. 31, 2019
shares
Apr. 30, 2019
USD ($)
shares
Mar. 31, 2018
shares
Sep. 30, 2019
USD ($)
shares
Sep. 30, 2018
USD ($)
Jun. 30, 2019
shares
Sep. 30, 2019
USD ($)
item
shares
Sep. 30, 2018
USD ($)
shares
Dec. 31, 2018
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Cash paid for taxes in lieu of shares upon vesting of RSU's | $       $ 620,000 $ 426,000   $ 6,120,000 $ 4,955,000  
Stock Options [Member]                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Expiration period             10 years    
Compensation expense | $       $ 90,000 62,000   $ 209,000 179,000  
Options exercised             11,179    
Options forfeited             4,000    
Stock units granted             34,000    
Options outstanding       162,236     162,236   143,415
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]                  
Compensation expense | $       $ 813,000 1,000,000.0   $ 2,500,000 $ 2,600,000  
Vesting period             5 years    
Stock units granted             6,400    
Stock units forfeited             1,460    
Awards outstanding       155,410     155,410   243,290
Stock units vested             92,820    
Issuance of common stock in connection with stock-based compensation, shares             53,859 62,030  
Common shares withheld upon vesting             38,961 43,393  
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%    
2014 Performance-Based Restricted Stock Unit Program [Member]                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Number of defined targets to achieve for restricted stock unit awards | item             3    
Number of defined targets to achieve for restricted stock unit awards | item             1    
Length of Restricted Stock Unit program (in years)             4 years    
Number of annual vesting installments | item             4    
2014 Performance-Based Restricted Stock Unit Program [Member] | Restricted Stock Units (RSUs) [Member]                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Stock units granted     145,350            
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]                  
Compensation expense | $       $ 1,200,000 $ 51,000   $ 1,300,000 $ 160,000  
Issuance of common stock in connection with stock-based compensation, shares   8,000           0  
Aggregate fair value of the shares issued | $   $ 1,200,000              
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