Income Taxes - Narrative (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Income taxes
Net deferred tax assets prior to valuation allowance	$ 47,897	$ 65,265
Consolidated TRS
Income taxes
Net deferred tax assets prior to valuation allowance	$ 42,434	$ 59,892
Valuation allowance provided (as a percent)	100.00%	100.00%
Net operating loss carryforwards for federal income tax purpose, subject to expiration	$ 167,780