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Debt Obligations Schedule of Debt Allocation (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Long-term Debt, by Type Alternative [Abstract]    
Fixed-rate debt $ 1,608,217 $ 615,721
Variable-rate debt 209,569 444,969
Total 1,817,786 1,060,690
Unsecured debt 1,202,476 831,969
Secured debt $ 615,310 $ 228,721