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Income Taxes - Schedule of income tax benefit of TRSs (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Income Tax Disclosure [Abstract]      
Current $ (176) $ 0 $ 0
Deferred (546) 3,223 4,269
Income tax (expense) benefit $ (722) $ 3,223 $ 4,269