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Disposal - Narrative (Details) - USD ($)
$ in Thousands
12 Months Ended
Aug. 31, 2015
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Loss on sale of business   $ 0 $ 0 $ 2,184
Disposal Group, Disposed of by Sale, Not Discontinued Operations | Cross Country Education, LLC        
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Aggregate amount of selling prices $ 8,000      
Escrow deposit $ 500      
Earn-out held in escrow, term (in months) 12 months      
Earnout (up to) $ 500      
Loss on sale of business $ 2,200     2,200
Recorded tax benefit related to sale of business       3,500
Gain on sale of discontinued operations, net of tax       $ 1,300