Other Non-Current Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Other Liabilities, Noncurrent [Abstract]
Deferred rent and unamortized lease incentives	$ 7,903	$ 9,897
Uncertain tax positions	1,788	2,903
Participated interest in notes receivable	24,409	24,237
Other liabilities	2,996	5,006
Total	$ 37,096	$ 42,043