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Debt Obligations (Details) - Debt Obligations - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Debt Disclosure [Abstract]    
Fixed-rate debt $ 1,584,205 $ 1,608,217
Variable-rate debt 268,568 209,569
Unsecured debt 1,261,180 1,202,476
Secured debt 591,593 615,310
Total $ 1,852,773 $ 1,817,786