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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $) | 12 Months Ended
--- | ---
Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Cash Flows from Operating Activities: |  |  |  |
Net income | $ 77,184,000 us-gaap_NetIncomeLoss | $ 84,512,000 us-gaap_NetIncomeLoss |  | $ 42,653,000 us-gaap_NetIncomeLoss
Discontinued Operation, Gain (Loss) on Disposal of Discontinued Operation, Net of Tax | 0 us-gaap_DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax | (30,840,000)us-gaap_DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax |  | 0 us-gaap_DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax
Depreciation and amortization | 38,296,000 us-gaap_DepreciationDepletionAndAmortization | 29,882,000 us-gaap_DepreciationDepletionAndAmortization |  | 24,702,000 us-gaap_DepreciationDepletionAndAmortization
Allowance for Doubtful Accounts Receivable, Period Increase (Decrease) | 7,047,000 us-gaap_AllowanceForDoubtfulAccountsReceivablePeriodIncreaseDecrease | 1,787,000 us-gaap_AllowanceForDoubtfulAccountsReceivablePeriodIncreaseDecrease |  | (166,000)us-gaap_AllowanceForDoubtfulAccountsReceivablePeriodIncreaseDecrease
Adjustments to reconcile net income to net cash provided by operating activities: |  |  |  |
Provision for deferred income taxes | 15,948,000 us-gaap_DeferredIncomeTaxesAndTaxCredits | 4,111,000 us-gaap_DeferredIncomeTaxesAndTaxCredits |  | 4,970,000 us-gaap_DeferredIncomeTaxesAndTaxCredits
Allocated Share-based Compensation Expense | 16,199,000.000 us-gaap_AllocatedShareBasedCompensationExpense | 14,411,000.000 us-gaap_AllocatedShareBasedCompensationExpense |  | 9,706,000.000 us-gaap_AllocatedShareBasedCompensationExpense
Write off of Deferred Debt Issuance Cost | 0 us-gaap_WriteOffOfDeferredDebtIssuanceCost | 14,958,000 us-gaap_WriteOffOfDeferredDebtIssuanceCost |  | 813,000 us-gaap_WriteOffOfDeferredDebtIssuanceCost
Gross excess tax benefits from stock-based compensation | (4,943,000)us-gaap_ExcessTaxBenefitFromShareBasedCompensationOperatingActivities | (5,308,000)us-gaap_ExcessTaxBenefitFromShareBasedCompensationOperatingActivities |  | (4,638,000)us-gaap_ExcessTaxBenefitFromShareBasedCompensationOperatingActivities
Workers’ compensation and medical malpractice provision | 3,321,000 asgn_WorkersCompensationAndMedicalMalpracticeProvision | 5,956,000 asgn_WorkersCompensationAndMedicalMalpracticeProvision |  | 3,594,000 asgn_WorkersCompensationAndMedicalMalpracticeProvision
Other Noncash Income (Expense) | (1,408,000)us-gaap_OtherNoncashIncomeExpense | 1,853,000 us-gaap_OtherNoncashIncomeExpense |  | (785,000)us-gaap_OtherNoncashIncomeExpense
Changes in operating assets and liabilities, net of effects of acquisitions and divestitures: |  |  |  |
Accounts receivable | (45,361,000)us-gaap_IncreaseDecreaseInAccountsReceivable | (20,155,000)us-gaap_IncreaseDecreaseInAccountsReceivable |  | (18,604,000)us-gaap_IncreaseDecreaseInAccountsReceivable
Prepaid expenses and income taxes | (8,304,000)us-gaap_IncreaseDecreaseInPrepaidExpense | 6,628,000 us-gaap_IncreaseDecreaseInPrepaidExpense |  | 2,166,000 us-gaap_IncreaseDecreaseInPrepaidExpense
Increase (Decrease) in Income Taxes Payable | (8,023,000)us-gaap_IncreaseDecreaseInAccruedIncomeTaxesPayable | (5,759,000)us-gaap_IncreaseDecreaseInAccruedIncomeTaxesPayable |  | 196,000 us-gaap_IncreaseDecreaseInAccruedIncomeTaxesPayable
Accounts payable | (1,693,000)us-gaap_IncreaseDecreaseInAccountsPayable | (1,580,000)us-gaap_IncreaseDecreaseInAccountsPayable |  | 1,987,000 us-gaap_IncreaseDecreaseInAccountsPayable
Accrued payroll and contract professional pay | 11,275,000 us-gaap_IncreaseDecreaseInAccruedSalaries | 17,554,000 us-gaap_IncreaseDecreaseInAccruedSalaries |  | (28,053,000)us-gaap_IncreaseDecreaseInAccruedSalaries
Increase (Decrease) in Workers' Compensation Liabilities | (2,192,000)us-gaap_IncreaseDecreaseInWorkersCompensationLiabilities | (2,348,000)us-gaap_IncreaseDecreaseInWorkersCompensationLiabilities |  | (2,049,000)us-gaap_IncreaseDecreaseInWorkersCompensationLiabilities
Deferred compensation | (20,000)us-gaap_IncreaseDecreaseInDeferredCompensation | (9,980,000)us-gaap_IncreaseDecreaseInDeferredCompensation |  | 312,000 us-gaap_IncreaseDecreaseInDeferredCompensation
Other | (4,120,000)us-gaap_IncreaseDecreaseInOtherOperatingCapitalNet | 8,548,000 us-gaap_IncreaseDecreaseInOtherOperatingCapitalNet |  | 2,323,000 us-gaap_IncreaseDecreaseInOtherOperatingCapitalNet
Net cash provided by operating activities | 96,022,000 us-gaap_NetCashProvidedByUsedInOperatingActivities | 110,524,000 us-gaap_NetCashProvidedByUsedInOperatingActivities |  | 40,697,000 us-gaap_NetCashProvidedByUsedInOperatingActivities
Cash Flows from Investing Activities: |  |  |  |
Cash paid for property and equipment | (19,729,000)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment | (16,531,000)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment |  | (14,354,000)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
Cash paid for acquisitions, net of cash acquired | 0 us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired | (110,700,000)us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired |  | (347,743,000)us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired
Proceeds from Divestiture of Businesses, Net of Cash Divested | 0 us-gaap_ProceedsFromDivestitureOfBusinessesNetOfCashDivested | 59,899,000 us-gaap_ProceedsFromDivestitureOfBusinessesNetOfCashDivested |  | 0 us-gaap_ProceedsFromDivestitureOfBusinessesNetOfCashDivested
Other | 169,000 us-gaap_PaymentsForProceedsFromOtherInvestingActivities | (1,023,000)us-gaap_PaymentsForProceedsFromOtherInvestingActivities |  | (869,000)us-gaap_PaymentsForProceedsFromOtherInvestingActivities
Net cash used in investing activities | (19,560,000)us-gaap_NetCashProvidedByUsedInInvestingActivities | (68,355,000)us-gaap_NetCashProvidedByUsedInInvestingActivities |  | (362,966,000)us-gaap_NetCashProvidedByUsedInInvestingActivities
Cash Flows from Financing Activities: |  |  |  |
Principal payments of long-term debt | (148,688,000)us-gaap_RepaymentsOfLongTermDebt | (456,275,000)us-gaap_RepaymentsOfLongTermDebt |  | (173,163,000)us-gaap_RepaymentsOfLongTermDebt
Proceeds from long-term debt | 164,000,000 us-gaap_ProceedsFromIssuanceOfLongTermDebt | 429,500,000 us-gaap_ProceedsFromIssuanceOfLongTermDebt |  | 513,000,000 us-gaap_ProceedsFromIssuanceOfLongTermDebt
Proceeds from option exercises and employee stock purchase plan | 6,358,000 us-gaap_ProceedsFromIssuanceOrSaleOfEquity | 7,054,000 us-gaap_ProceedsFromIssuanceOrSaleOfEquity |  | 8,384,000 us-gaap_ProceedsFromIssuanceOrSaleOfEquity
Payment of employment taxes related to release of restricted stock awards | (6,498,000)us-gaap_PaymentsForOtherTaxes | (7,600,000)us-gaap_PaymentsForOtherTaxes | [1] | (2,627,000)us-gaap_PaymentsForOtherTaxes
Gross excess tax benefits from stock-based compensation | 4,943,000 us-gaap_ExcessTaxBenefitFromShareBasedCompensationFinancingActivities | 5,308,000 us-gaap_ExcessTaxBenefitFromShareBasedCompensationFinancingActivities |  | 4,638,000 us-gaap_ExcessTaxBenefitFromShareBasedCompensationFinancingActivities
Repurchase of common stock | (100,049,000)us-gaap_PaymentsForRepurchaseOfCommonStock | 0 us-gaap_PaymentsForRepurchaseOfCommonStock |  | 0 us-gaap_PaymentsForRepurchaseOfCommonStock
Debt issuance or amendment costs | (467,000)us-gaap_PaymentsOfFinancingCosts | (6,938,000)us-gaap_PaymentsOfFinancingCosts |  | (17,113,000)us-gaap_PaymentsOfFinancingCosts
Payments of accrued earn-outs | (691,000)us-gaap_OtherPaymentsToAcquireBusinesses | (3,425,000)us-gaap_OtherPaymentsToAcquireBusinesses |  | (1,198,000)us-gaap_OtherPaymentsToAcquireBusinesses
Other | 0 us-gaap_ProceedsFromPaymentsForOtherFinancingActivities | (14,000)us-gaap_ProceedsFromPaymentsForOtherFinancingActivities |  | (43,000)us-gaap_ProceedsFromPaymentsForOtherFinancingActivities
Net cash provided by (used in) financing activities | (81,092,000)us-gaap_NetCashProvidedByUsedInFinancingActivities | (32,390,000)us-gaap_NetCashProvidedByUsedInFinancingActivities |  | 331,878,000 us-gaap_NetCashProvidedByUsedInFinancingActivities
Effect of exchange rate changes on cash and cash equivalents | (1,006,000)us-gaap_EffectOfExchangeRateOnCashAndCashEquivalents | 92,000 us-gaap_EffectOfExchangeRateOnCashAndCashEquivalents |  | 131,000 us-gaap_EffectOfExchangeRateOnCashAndCashEquivalents
Net Increase (Decrease) in Cash and Cash Equivalents | (5,636,000)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease | 9,871,000 us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease |  | 9,740,000 us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease
Cash and Cash Equivalents at Beginning of Year (1) | 37,350,000 us-gaap_CashAndCashEquivalentsAtCarryingValue | 27,479,000 us-gaap_CashAndCashEquivalentsAtCarryingValue |  | 17,739,000 us-gaap_CashAndCashEquivalentsAtCarryingValue
Cash and Cash Equivalents at End of Year (1) | 31,714,000 us-gaap_CashAndCashEquivalentsAtCarryingValue | 37,350,000 us-gaap_CashAndCashEquivalentsAtCarryingValue |  | 27,479,000 us-gaap_CashAndCashEquivalentsAtCarryingValue
Supplemental Disclosure of Cash Flow Information |  |  |  |
Income taxes | 56,320,000 us-gaap_IncomeTaxesPaidNet | 32,350,000 us-gaap_IncomeTaxesPaidNet |  | 33,915,000 us-gaap_IncomeTaxesPaidNet
Interest | 11,559,000 us-gaap_InterestPaidNet | 15,158,000 us-gaap_InterestPaidNet |  | 14,722,000 us-gaap_InterestPaidNet
Non-Cash Investing and Financing Activities: |  |  |  |
Equity consideration for acquisition | 0 us-gaap_StockIssued1 | 0 us-gaap_StockIssued1 |  | 225,558,000 us-gaap_StockIssued1
Payable for employment taxes withheld related to release of restricted stock awards | 0 asgn_PayableForEmploymentTaxesRelatedToRestrictedStockAwards | 0 asgn_PayableForEmploymentTaxesRelatedToRestrictedStockAwards |  | 2,907,000 asgn_PayableForEmploymentTaxesRelatedToRestrictedStockAwards
Acquisition of property and equipment through accounts payable | 2,932,000 us-gaap_CapitalExpendituresIncurredButNotYetPaid | 594,000 us-gaap_CapitalExpendituresIncurredButNotYetPaid |  | 369,000 us-gaap_CapitalExpendituresIncurredButNotYetPaid
Acquisition accounting | $ 0 us-gaap_GoodwillPurchaseAccountingAdjustments | $ 0 us-gaap_GoodwillPurchaseAccountingAdjustments |  | $ (1,805,000)us-gaap_GoodwillPurchaseAccountingAdjustments
[1] | Cash and cash equivalents at December 31, 2014, 2013, 2012 and 2011 include $2.9 million, $2.3 million, $2.6 million and $4.3 million, respectively, from the Physician Segment (see "Note 5. Discontinued Operations").

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- Definition The increase (decrease) during the period in accrued salaries. + 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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- Definition The increase (decrease) during the reporting period in the obligation created by employee agreements whereby earned compensation will be paid in the future. + 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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- Definition The increase (decrease) during the reporting period in other assets used in operating activities less other operating liabilities used in operating activities not separately disclosed in the statement of cash flows. May include changes in other current assets and liabilities, other noncurrent assets and liabilities, or a combination of other current and noncurrent assets and liabilities. + 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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- Definition The increase (decrease) during the reporting period in the amount of outstanding money paid in advance for goods or services that bring economic benefits for future periods. + 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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- Definition The increase (decrease) during the reporting period in the amount due for insurance (or actual expenses) to cover the medical expenses and lost income for employees that are injured during the course of doing work-related activities. + 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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- Definition The amount of cash paid for interest during the period net of cash paid for interest that is capitalized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4297-108586 + Details
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- Definition Amount of cash inflow (outflow) from investing activities, including discontinued operations. Investing activity cash flows include making and collecting loans and acquiring and disposing of debt or equity instruments and property, plant, and equipment and other productive assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 24 -URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3521-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 26 -URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3574-108585 + Details
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- Definition Amount of cash inflow (outflow) from operating activities, including discontinued operations. Operating activity cash flows include transactions, adjustments, and changes in value not defined as investing or financing activities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 24 -URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3521-108585 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 25 -URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3536-108585 + Details
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- Definition The portion of profit or loss for the period, net of income taxes, which is attributable to the parent. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Other Comprehensive Income -URI http://asc.fasb.org/extlink&oid=51831270 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Net Income -URI http://asc.fasb.org/extlink&oid=51831255 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04.19) -URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.18) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04.22) -URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913 Reference 8: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 19 -Article 5 Reference 9: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 20 -Article 9 + Details
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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 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 for loan and debt issuance costs. + 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 -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 a business, net of the cash acquired from the purchase. + 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 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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