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Debt Obligations (Debt Maturities) (Details) - USD ($)
Sep. 30, 2017
Dec. 31, 2016
Jul. 25, 2016
Debt Disclosure [Abstract]      
Accrued interest $ 27,200,000 $ 34,100,000  
Future expected/scheduled maturities of outstanding debt and capital lease      
2017 (remaining three months) 13,165,000    
2018 227,892,000    
2019 618,437,000    
2020 673,217,000    
2021 686,225,000    
Thereafter 3,525,453,000    
Total debt maturities 5,744,389,000    
Net unamortized premiums and discounts 2,838,000    
Net unamortized debt issuance costs (33,539,000)    
Total debt obligations, net 5,713,688,000 5,838,889,000  
Debt Instrument [Line Items]      
Long-term debt 5,744,389,000    
Unsecured debt      
Future expected/scheduled maturities of outstanding debt and capital lease      
Total debt maturities 3,218,453,000 2,318,453,000  
Net unamortized debt issuance costs (23,306,000) (17,402,000)  
Debt Instrument [Line Items]      
Long-term debt $ 3,218,453,000 $ 2,318,453,000  
Unsecured debt | Revolving Credit Facility      
Debt Instrument [Line Items]      
Credit facility maximum borrowing capacity     $ 2,750,000,000.00