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Relationships with Managers - Schedule of Management Fees (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Relationships With Managers [Abstract]      
Base management fees $ 22,265 $ 24,480 $ 25,491
Incentive management fees 6,259 7,810 7,405
Amortization of deferred income related to key money (4,840) (432) (548)
Amortization of unfavorable contract liabilities (1,715) (1,715) (1,715)
Total management fees, net $ 21,969 $ 30,143 $ 30,633