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Debt Obligations, net (Future Scheduled Maturities) (Details) - USD ($)
$ in Thousands
1 Months Ended
Nov. 02, 2017
Sep. 30, 2017
Dec. 31, 2016
Maturities of Long-term Debt [Abstract]      
2017 (remaining three months)   $ 550,000  
2018   609,523  
2019   797,924  
2020   400,000  
2021   792,506  
Thereafter   1,193,229  
Total principal maturities   4,343,182 $ 3,418,357
Unamortized discounts and deferred financing costs, net   (64,228) (28,449)
Total debt obligations, net   4,278,954 $ 3,389,908
Unsecured Debt      
Maturities of Long-term Debt [Abstract]      
2017 (remaining three months)   550,000  
2018   600,000  
2019   770,000  
2020   400,000  
2021   275,000  
Thereafter   1,125,000  
Total principal maturities   3,720,000  
Unamortized discounts and deferred financing costs, net   (56,331)  
Total debt obligations, net   3,663,669  
Secured Debt      
Maturities of Long-term Debt [Abstract]      
2017 (remaining three months)   0  
2018   9,523  
2019   27,924  
2020   0  
2021   517,506  
Thereafter   68,229  
Total principal maturities   623,182  
Unamortized discounts and deferred financing costs, net   (7,897)  
Total debt obligations, net   $ 615,285  
4.00% senior notes      
Maturities of Long-term Debt [Abstract]      
Stated interest rates (as a percent)   4.00%  
7.125% senior notes      
Maturities of Long-term Debt [Abstract]      
Stated interest rates (as a percent)   7.125%  
4.875% senior notes      
Maturities of Long-term Debt [Abstract]      
Stated interest rates (as a percent)   4.875%  
Subsequent Event | 4.00% senior notes      
Maturities of Long-term Debt [Abstract]      
Extinguishment of debt, amount $ 550,000    
Subsequent Event | 7.125% senior notes      
Maturities of Long-term Debt [Abstract]      
Extinguishment of debt, amount 300,000    
Subsequent Event | 4.875% senior notes      
Maturities of Long-term Debt [Abstract]      
Extinguishment of debt, amount $ 300,000