Income Taxes - Summary of Significant Components of Benefits for Income Taxes Attributable to Continuing Operations (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Current
Federal	$ 12,051	$ 4,255
State	710	218
International	2	29
Total current	12,763	4,502
Deferred
Federal	9,636	14,518
State	902	672
Total deferred	10,538	15,190
Total income tax benefit from continuing operations	$ 23,301	$ 19,692