Income Taxes (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Income Taxes
Income tax benefit	$ (2,539)	$ (5,919)	$ (6,580)	$ (3,269)
Effective tax rate (as a percent)			27.30%	6.50%
Tax (benefit) based on estimated effective tax rate for the full year			$ 3,884
Income tax benefit, Tax windfall			$ (2,186)	$ (3,741)
Offset by tax expense based on estimated annual effective tax rate expected				$ 472