Income Taxes - Provision (benefit) for income taxes (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Current:
Federal	$ (15,699)	$ (112)	$ (2,000)
State	(2,260)	657	173
Current income tax	(17,959)	545	(1,827)
Deferred:
Federal	496	1,348	9,435
State	(375)	1,003	1,863
Deferred income tax	121	2,351	11,298
Total (benefit) provision for income taxes	$ (17,838)	$ 2,896	$ 9,471