Income Taxes - Reconciliation of income tax benefit (provision) of the TRSs to the amount computed by applying the federal corporate tax rate (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Income Tax Disclosure [Abstract]
Book loss for TRSs	$ 19,525	$ 2,094	$ 5,254
Tax at statutory rate on earnings from continuing operations before income taxes	4,100	712	1,786
Change in tax rates	0	(14,189)	0
State taxes	513	109	160
Other	(1,009)	(2,226)	(2,668)
Income tax benefit (expense)	$ 3,604	$ (15,594)	$ (722)