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Combined Guarantor Subsidiaries - Leases - Components of Rental Revenue (Details) - Guarantor Subsidiaries - USD ($)
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
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