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Income Taxes - Significant Components of Deferred Tax Assets and Liabilities (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Deferred tax assets:    
Net operating losses (federal and state) $ 2,996us-gaap_DeferredTaxAssetsOperatingLossCarryforwards $ 8,994us-gaap_DeferredTaxAssetsOperatingLossCarryforwards
Accrued expenses 9,381us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAccruedLiabilities 7,995us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAccruedLiabilities
Accrued workers compensation costs 13,964us-gaap_DeferredTaxAssetsTaxDeferredExpenseOther 5,489us-gaap_DeferredTaxAssetsTaxDeferredExpenseOther
Stock-based compensation 2,508us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost 1,669us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost
Tax benefits relating to uncertain positions 20us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsContingencies 72us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsContingencies
Tax credits (federal and state) 9,865us-gaap_DeferredTaxAssetsTaxCreditCarryforwards 4,318us-gaap_DeferredTaxAssetsTaxCreditCarryforwards
Other 354us-gaap_DeferredTaxAssetsOther 160us-gaap_DeferredTaxAssetsOther
Total 39,088us-gaap_DeferredTaxAssetsGross 28,697us-gaap_DeferredTaxAssetsGross
Valuation allowance (6,945)us-gaap_DeferredTaxAssetsValuationAllowance (5,194)us-gaap_DeferredTaxAssetsValuationAllowance
Total deferred tax assets 32,143us-gaap_DeferredTaxAssetsNet 23,503us-gaap_DeferredTaxAssetsNet
Deferred tax liabilities:    
Depreciation and amortization (10,643)us-gaap_DeferredTaxLiabilitiesDeferredExpense (22,259)us-gaap_DeferredTaxLiabilitiesDeferredExpense
Deferred service revenues (77,827)us-gaap_DeferredTaxLiabilitiesTaxDeferredIncome (24,456)us-gaap_DeferredTaxLiabilitiesTaxDeferredIncome
Prepaid health plan expenses (2,202)us-gaap_DeferredTaxLiabilitiesPrepaidExpenses (1,143)us-gaap_DeferredTaxLiabilitiesPrepaidExpenses
Total deferred tax liabilities (90,672)us-gaap_DeferredIncomeTaxLiabilities (47,858)us-gaap_DeferredIncomeTaxLiabilities
Net deferred tax liabilities $ (58,529)us-gaap_DeferredTaxAssetsLiabilitiesNet $ (24,355)us-gaap_DeferredTaxAssetsLiabilitiesNet