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Debt Obligations (Details) - Debt Obligations - USD ($)
$ in Thousands
Sep. 30, 2019
Dec. 31, 2018
Debt Disclosure [Abstract]    
Fixed-rate debt $ 1,924,544 $ 2,216,669
Variable-rate debt 516,410 244,769
Unsecured debt 1,918,410 1,931,769
Secured debt 522,544 529,669
Total $ 2,440,954 $ 2,461,438