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, 2020	Dec. 31, 2019	Dec. 31, 2018
Income Tax Disclosure [Abstract]
Book loss (income) for TRSs	$ 6,058	$ (2,062)	$ 19,525
Tax at statutory rate on earnings from continuing operations before income taxes	1,272	(433)	4,100
State taxes	(31)	(280)	513
Other	(794)	(876)	(1,009)
Income tax benefit (expense)	$ 447	$ (1,589)	$ 3,604