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Consolidated Statements of Comprehensive Income (Unaudited) (USD $) In Thousands, except Per Share data, unless otherwise specified | 3 Months Ended
--- | ---
Mar. 31, 2015 | Mar. 31, 2014
Statement of Comprehensive Income [Abstract] |  |
Revenue | $ 213,866 us-gaap_Revenues | $ 204,726 us-gaap_Revenues
Operating expenses | 170,864 us-gaap_CostOfRevenue | 161,938 us-gaap_CostOfRevenue
Gross margin | 43,002 us-gaap_GrossProfit | 42,788 us-gaap_GrossProfit
Corporate general and administrative expenses | 9,865 us-gaap_GeneralAndAdministrativeExpense | 10,198 us-gaap_GeneralAndAdministrativeExpense
Operating income | 33,137 us-gaap_OperatingIncomeLoss | 32,590 us-gaap_OperatingIncomeLoss
Other income (expense): |  |
Interest expense | (2,977)us-gaap_InterestExpense | (3,433)us-gaap_InterestExpense
Gain on sale of operations, net | 56 us-gaap_DisposalGroupNotDiscontinuedOperationGainLossOnDisposal | 8 us-gaap_DisposalGroupNotDiscontinuedOperationGainLossOnDisposal
Other income, net | 2,859 us-gaap_OtherNonoperatingIncomeExpense | 1,975 us-gaap_OtherNonoperatingIncomeExpense
Total other expense, net | (62)us-gaap_NonoperatingIncomeExpense | (1,450)us-gaap_NonoperatingIncomeExpense
Income from continuing operations before income tax expense | 33,075 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | 31,140 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments
Income tax expense | 13,572 us-gaap_IncomeTaxExpenseBenefit | 13,114 us-gaap_IncomeTaxExpenseBenefit
Income from continuing operations | 19,503 us-gaap_IncomeLossFromContinuingOperations | 18,026 us-gaap_IncomeLossFromContinuingOperations
Loss from operations of discontinued operations, net of tax | (335)us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationDuringPhaseOutPeriodNetOfTax | (263)us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationDuringPhaseOutPeriodNetOfTax
Loss on disposal of discontinued operations, net of tax |  | (474)us-gaap_DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax
Net income | 19,168 us-gaap_NetIncomeLoss | 17,289 us-gaap_NetIncomeLoss
Basic: |  |
Continuing operations | $ 0.41 us-gaap_IncomeLossFromContinuingOperationsPerBasicShare | $ 0.37 us-gaap_IncomeLossFromContinuingOperationsPerBasicShare
Discontinued operations | $ (0.01)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare | $ (0.01)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare
Net income | $ 0.40 us-gaap_EarningsPerShareBasic | $ 0.36 us-gaap_EarningsPerShareBasic
Diluted: |  |
Continuing operations | $ 0.38 us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare | $ 0.34 us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare
Discontinued operations | $ (0.01)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare | $ (0.01)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare
Net income | $ 0.37 us-gaap_EarningsPerShareDiluted | $ 0.33 us-gaap_EarningsPerShareDiluted
Basic weighted average shares outstanding | 48,146 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 48,182 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Diluted weighted average shares outstanding | 51,385 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 52,618 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding
Comprehensive Income: |  |
Net income | 19,168 us-gaap_NetIncomeLoss | 17,289 us-gaap_NetIncomeLoss
Other comprehensive income, net of tax | 138 us-gaap_OtherComprehensiveIncomeLossNetOfTax | 9 us-gaap_OtherComprehensiveIncomeLossNetOfTax
Comprehensive income | $ 19,306 us-gaap_ComprehensiveIncomeNetOfTax | $ 17,298 us-gaap_ComprehensiveIncomeNetOfTax

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- Definition Amount after tax of increase (decrease) in equity from transactions and other events and circumstances from net income and other comprehensive income, attributable to parent entity. Excludes changes in equity resulting from investments by owners and distributions to owners. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Other Comprehensive Income -URI http://asc.fasb.org/extlink&oid=6519514 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Comprehensive Income -URI http://asc.fasb.org/extlink&oid=35737396 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=36458714&loc=d3e557-108580 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=6518256 + Details
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