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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