Income Taxes - Schedule of tax effects of temporary differences and carryforwards of the TRSs included in net deferred tax assets (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Income Tax Disclosure [Abstract]
Net operating loss carryforwards	$ 21,398	$ 22,335
Property, primarily differences in depreciation and amortization, the tax basis of land assets and treatment of certain other costs	5,077	12,720
Other	2,531	3,246
Deferred tax assets	$ 29,006	$ 38,301