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Combined Guarantor Subsidiaries - Leases - Components of Rental Revenue (Details) - USD ($)
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Lessor Lease Description [Line Items]      
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
Guarantor Subsidiaries      
Lessor Lease Description [Line Items]      
Fixed lease payments 229,507,000 261,090,000 291,144,000
Variable lease payments 47,945,000 50,714,000 52,383,000
Total rental revenues $ 277,452,000 $ 311,804,000 $ 343,527,000