Quarterly report pursuant to Section 13 or 15(d)

Leasing Activity (Narrative) (Details)

v3.19.3
Leasing Activity (Narrative) (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Operating Leased Assets [Line Items]        
Rental income, variable lease payments $ 24.0 $ 22.9 $ 73.0 $ 69.1
Percentage of leased asset subjected to termination options 3.30%   3.30%  
Percentage of leased asset exercisable in period 1.40%   1.40%  
Termination option, exercisable through date     Dec. 31, 2019  
Maximum [Member]        
Operating Leased Assets [Line Items]        
Non-cancelable lease term 10 years   10 years  
Minimum [Member]        
Operating Leased Assets [Line Items]        
Non-cancelable lease term 1 year   1 year