Income Taxes (Income Before Income Taxes and Provision for Income Taxes) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Income (loss) before income tax provision (benefit)
Domestic	$ 34,885	$ 26,383	$ (74,402)
Foreign	(415)	(1,584)	(2,171)
Total	34,470	24,799	(76,573)
Current income tax provision (benefit):
Federal	(9,200)	6,427	2,778
State	782	2,185	(472)
Foreign	584	1,145	586
Total current	(7,834)	9,757	2,892
Deferred income tax provision (benefit):
Federal	12,393	(7,472)	(38,829)
State	214	925	(1,817)
Foreign	90	(395)	(701)
Total deferred	12,697	(6,942)	(41,347)
Income tax provision	$ 4,863	$ 2,815	$ (38,455)