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Corporate Indebtedness - Additional Information (Details)
12 Months Ended
Dec. 31, 2020
USD ($)
extension
Dec. 31, 2019
USD ($)
Corporate Indebtedness    
Outstanding under line of credit facility $ 105,262,000 $ 234,013,000
Long-term debt $ 1,979,972,000 2,183,253,000
Revolving credit facility    
Corporate Indebtedness    
Facility fee (as a percent) 20.00%  
Outstanding under line of credit facility $ 110,000,000.0  
Revolving credit facility | Minimum    
Corporate Indebtedness    
Facility fee (as a percent) 12.50%  
Revolving credit facility | Maximum    
Corporate Indebtedness    
Facility fee (as a percent) 30.00%  
2012 Credit Facility    
Corporate Indebtedness    
Credit facility, maximum borrowing capacity $ 1,500,000,000  
Letters of credit 26,000,000.0  
Ability to borrow under line of credit facility 1,400,000,000  
Line of Credit | Term loan    
Corporate Indebtedness    
Long-term debt 1,500,000,000 1,500,000,000
Line of Credit | 2012 Credit Facility    
Corporate Indebtedness    
Long-term debt 105,300,000 $ 234,000,000.0
Term loan | Term Loan A, Maturity March 31, 2023    
Corporate Indebtedness    
Credit facility, maximum borrowing capacity $ 1,300,000,000  
Term loan | Term Loan A, Maturity March 31, 2023 | LIBOR    
Corporate Indebtedness    
Interest rate added to base rate (as a percent) 110.00%  
Term loan | Term Loan A, Maturity March 31, 2023 | LIBOR | Minimum    
Corporate Indebtedness    
Interest rate added to base rate (as a percent) 90.00%  
Term loan | Term Loan A, Maturity March 31, 2023 | LIBOR | Maximum    
Corporate Indebtedness    
Interest rate added to base rate (as a percent) 175.00%  
Term loan | Term Loan B, Maturity November 21, 2024    
Corporate Indebtedness    
Credit facility, maximum borrowing capacity $ 200,000,000.0  
Term loan | Term Loan B, Maturity November 21, 2024 | LIBOR    
Corporate Indebtedness    
Interest rate added to base rate (as a percent) 100.00%  
Term loan | Term Loan B, Maturity November 21, 2024 | LIBOR | Minimum    
Corporate Indebtedness    
Interest rate added to base rate (as a percent) 85.00%  
Term loan | Term Loan B, Maturity November 21, 2024 | LIBOR | Maximum    
Corporate Indebtedness    
Interest rate added to base rate (as a percent) 165.00%  
Revolving credit facility | Line of Credit | Revolving Credit Facility, Maturity March 31, 2022    
Corporate Indebtedness    
Credit facility, maximum borrowing capacity $ 1,500,000,000  
Number of extensions | extension 2  
Term of extension 6 months  
Maximum borrowing capacity, optional expansion $ 4,500,000,000  
Revolving credit facility | Line of Credit | Revolving Credit Facility, Maturity March 31, 2022 | LIBOR    
Corporate Indebtedness    
Interest rate added to base rate (as a percent) 100.00%  
Revolving credit facility | Line of Credit | Revolving Credit Facility, Maturity March 31, 2022 | LIBOR | Minimum    
Corporate Indebtedness    
Interest rate added to base rate (as a percent) 82.50%  
Revolving credit facility | Line of Credit | Revolving Credit Facility, Maturity March 31, 2022 | LIBOR | Maximum    
Corporate Indebtedness    
Interest rate added to base rate (as a percent) 155.00%