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Discontinued Operations - Summary of Revenues and Pretax Profits (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Discontinued Operations and Disposal Groups [Abstract]      
Net service revenues $ 56,670us-gaap_DisposalGroupIncludingDiscontinuedOperationRevenue $ 78,159us-gaap_DisposalGroupIncludingDiscontinuedOperationRevenue $ 76,992us-gaap_DisposalGroupIncludingDiscontinuedOperationRevenue
Income from discontinued operations, before income taxes $ 103,512us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationBeforeIncomeTax $ 9,169us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationBeforeIncomeTax $ 10,792us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationBeforeIncomeTax