Income Taxes (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017
Income Tax Disclosure [Abstract]
Income tax expense/(benefit)	$ (584)	$ (2,199)	$ (9,364)	$ (3,675)
Effective income tax rate (as a percent)	8.00%	(45.30%)	(56.70%)	(26.80%)
Income tax interest or penalties accrued	$ 0		$ 0		$ 0