XML 133 R94.htm IDEA: XBRL DOCUMENT v3.20.1
Leases - Components of Rental Revenue (Details) - USD ($)
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Leases [Abstract]      
Fixed lease payments $ 607,259,000 $ 684,634,000 $ 760,001,000
Variable lease payments 129,619,000 144,479,000 149,594,000
Total rental revenues $ 736,878,000 $ 829,113,000 $ 909,595,000