Income Taxes - Schedule of Unrecognized Tax Benefits (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Unrecognized Tax Benefits, Beginning Balance	$ 2,195	$ 943	$ 1,919
Additions for tax positions taken in prior years	43	1,295	43
Reductions for tax positions taken in prior years			(666)
Reductions for lapse of applicable statutes	(813)	(43)	(353)
Unrecognized Tax Benefits, Ending Balance	1,425	2,195	943
Continuing Operations
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Unrecognized Tax Benefits, Beginning Balance	1,559	307	1,283
Additions for tax positions taken in prior years	43	1,295	43
Reductions for tax positions taken in prior years			(666)
Reductions for lapse of applicable statutes	(177)	(43)	(353)
Unrecognized Tax Benefits, Ending Balance	1,425	1,559	307
Discontinued Operations
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Unrecognized Tax Benefits, Beginning Balance	636	636	636
Additions for tax positions taken in prior years	0	0	0
Reductions for tax positions taken in prior years			0
Reductions for lapse of applicable statutes	(636)	0	0
Unrecognized Tax Benefits, Ending Balance	$ 0	$ 636	$ 636