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Accrued and Other Liabilities - Other Liabilities (Details) - USD ($)
$ in Thousands
Sep. 30, 2017
Dec. 31, 2016
Other Liabilities Disclosure [Abstract]    
Non-current portion of deferred revenues $ 14,111 $ 8,933
Straight-line management fee waiver 24,934 11,974
Other 1,135 2,836
Other liabilities $ 40,180 $ 23,743