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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $) In Thousands, unless otherwise specified | 3 Months Ended
--- | ---
Mar. 31, 2015 | Mar. 31, 2014
Cash Flows from Operating Activities: |  |
Net income | $ 39,135 us-gaap_NetIncomeLoss | $ 13,917 us-gaap_NetIncomeLoss
Adjustments to reconcile net income to net cash provided by operating activities: |  |
Gain on sale of discontinued operations, net of income taxes | (25,703)us-gaap_DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax | 0 us-gaap_DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax
Depreciation and amortization | 8,665 us-gaap_DepreciationDepletionAndAmortization | 8,959 us-gaap_DepreciationDepletionAndAmortization
Stock-based compensation | 3,954 us-gaap_ShareBasedCompensation | 3,190 us-gaap_ShareBasedCompensation
Gross excess tax benefits from stock-based compensation | (1,643)us-gaap_ExcessTaxBenefitFromShareBasedCompensationOperatingActivities | (2,088)us-gaap_ExcessTaxBenefitFromShareBasedCompensationOperatingActivities
Workers’ compensation and medical malpractice provision | 586 asgn_WorkersCompensationAndMedicalMalpracticeProvision | 1,592 asgn_WorkersCompensationAndMedicalMalpracticeProvision
Other | 1,930 us-gaap_OtherNoncashIncome | 2,029 us-gaap_OtherNoncashIncome
Changes in operating assets and liabilities, net of effects of divestiture: |  |
Accounts receivable | (14,584)us-gaap_IncreaseDecreaseInAccountsReceivable | (16,476)us-gaap_IncreaseDecreaseInAccountsReceivable
Prepaid expenses and income taxes | 7,954 asgn_IncreaseDecreaseInPrepaidExpensesAndIncomeTaxes | 3,950 asgn_IncreaseDecreaseInPrepaidExpensesAndIncomeTaxes
Accounts payable | 205 us-gaap_IncreaseDecreaseInAccountsPayable | (3,006)us-gaap_IncreaseDecreaseInAccountsPayable
Accrued payroll and contract professional pay | 3,160 us-gaap_IncreaseDecreaseInAccruedSalaries | 599 us-gaap_IncreaseDecreaseInAccruedSalaries
Income taxes payable | (539)us-gaap_IncreaseDecreaseInAccruedIncomeTaxesPayable | (12,445)us-gaap_IncreaseDecreaseInAccruedIncomeTaxesPayable
Workers’ compensation and medical malpractice loss reserves | (309)us-gaap_IncreaseDecreaseInWorkersCompensationLiabilities | (920)us-gaap_IncreaseDecreaseInWorkersCompensationLiabilities
Other | (2,868)us-gaap_IncreaseDecreaseInOtherOperatingCapitalNet | (3,622)us-gaap_IncreaseDecreaseInOtherOperatingCapitalNet
Net cash provided by (used in) operating activities | 19,943 us-gaap_NetCashProvidedByUsedInOperatingActivities | (4,321)us-gaap_NetCashProvidedByUsedInOperatingActivities
Cash Flows from Investing Activities: |  |
Cash paid for property and equipment | (8,000)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment | (4,020)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
Cash received from sale of discontinued operations, net | 114,884 us-gaap_ProceedsFromDivestitureOfBusinessesNetOfCashDivested | 0 us-gaap_ProceedsFromDivestitureOfBusinessesNetOfCashDivested
Other | 12 us-gaap_PaymentsForProceedsFromOtherInvestingActivities | 130 us-gaap_PaymentsForProceedsFromOtherInvestingActivities
Net cash provided by (used in) investing activities | 106,896 us-gaap_NetCashProvidedByUsedInInvestingActivities | (3,890)us-gaap_NetCashProvidedByUsedInInvestingActivities
Cash Flows from Financing Activities: |  |
Principal payments of long-term debt | (80,563)us-gaap_RepaymentsOfLongTermDebt | (105,500)us-gaap_RepaymentsOfLongTermDebt
Proceeds from long-term debt | 0 us-gaap_ProceedsFromIssuanceOfLongTermDebt | 99,500 us-gaap_ProceedsFromIssuanceOfLongTermDebt
Proceeds from option exercises and employee stock purchase plan | 3,555 us-gaap_ProceedsFromIssuanceOrSaleOfEquity | 2,967 us-gaap_ProceedsFromIssuanceOrSaleOfEquity
Payment of employment taxes related to release of restricted stock awards | (3,991)us-gaap_PaymentsForOtherTaxes | (3,277)us-gaap_PaymentsForOtherTaxes
Gross excess tax benefits from stock-based compensation | 1,643 us-gaap_ExcessTaxBenefitFromShareBasedCompensationFinancingActivities | 2,088 us-gaap_ExcessTaxBenefitFromShareBasedCompensationFinancingActivities
Repurchase of common stock | (1,645)us-gaap_PaymentsForRepurchaseOfCommonStock | 0 us-gaap_PaymentsForRepurchaseOfCommonStock
Debt issuance or amendment costs | (486)us-gaap_PaymentsOfDebtIssuanceCosts | (446)us-gaap_PaymentsOfDebtIssuanceCosts
Payments of accrued earn-outs | 0 us-gaap_OtherPaymentsToAcquireBusinesses | (691)us-gaap_OtherPaymentsToAcquireBusinesses
Net cash used in financing activities | (81,487)us-gaap_NetCashProvidedByUsedInFinancingActivities | (5,359)us-gaap_NetCashProvidedByUsedInFinancingActivities
Effect of exchange rate changes on cash and cash equivalents | (703)us-gaap_EffectOfExchangeRateOnCashAndCashEquivalents | (386)us-gaap_EffectOfExchangeRateOnCashAndCashEquivalents
Net Increase (Decrease) in Cash and Cash Equivalents | 44,649 us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease | (13,956)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease
Cash and Cash Equivalents at Beginning of Year | 28,860 us-gaap_CashAndCashEquivalentsAtCarryingValue | 37,350 us-gaap_CashAndCashEquivalentsAtCarryingValue
Cash and Cash Equivalents at End of Period | 76,363 us-gaap_CashAndCashEquivalentsAtCarryingValue | 23,394 us-gaap_CashAndCashEquivalentsAtCarryingValue
Supplemental Disclosure of Cash Flow Information: |  |
Income taxes | 1,142 us-gaap_IncomeTaxesPaidNet | 21,034 us-gaap_IncomeTaxesPaidNet
Interest | 2,695 us-gaap_InterestPaidNet | 3,087 us-gaap_InterestPaidNet
Supplemental Disclosure of Non-Cash Transactions: |  |
Acquisition of property and equipment through accounts payable | $ 1,011 us-gaap_CapitalExpendituresIncurredButNotYetPaid | $ 870 us-gaap_CapitalExpendituresIncurredButNotYetPaid

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- Definition The cash outflow associated with other payments to acquire businesses including deposit on pending acquisitions and preacquisition costs. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Investing Activities -URI http://asc.fasb.org/extlink&oid=6516133 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3213-108585 + Details
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- Definition The amount of cash paid during the current period for taxes other than income taxes. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 25 -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3536-108585 + Details
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- Definition The net cash outflow or inflow from other investing activities. This element is used when there is not a more specific and appropriate element in the taxonomy. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Investing Activities -URI http://asc.fasb.org/extlink&oid=6516133 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3095-108585 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3098-108585 + Details
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- Definition The cash outflow to reacquire common stock during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3291-108585 + Details
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- Definition The cash outflow paid to third parties in connection with debt origination, which will be amortized over the remaining maturity period of the associated long-term debt. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3291-108585 + Details
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- Definition The cash outflow associated with the acquisition of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale; includes cash outflows to pay for construction of self-constructed assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Investing Activities -URI http://asc.fasb.org/extlink&oid=6516133 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3213-108585 + Details
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- Definition This element represents the cash inflow during the period from the sale of a component of the entity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Investing Activities -URI http://asc.fasb.org/extlink&oid=6516133 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3179-108585 + Details
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- Definition The cash inflow from a debt initially having maturity due after one year or beyond the operating cycle, if longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3255-108585 + Details
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- Definition The cash inflow from the issuance of common stock, preferred stock, treasury stock, stock options, and other types of equity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3255-108585 + Details
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- Definition The cash outflow for debt initially having maturity due after one year or beyond the normal operating cycle, if longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3291-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 + Details
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- Definition The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3602-108585 + Details
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