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Earnings Per Share (Reconciliation of EPS) (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified | 3 Months Ended | 12 Months Ended
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Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2013 | Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2013 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Basic EPS: [Abstract] |  |  |  |  |  |  |  |  |  |  |
Net income from continuing operations | $ 41,350 us-gaap_IncomeLossFromContinuingOperations | $ 53,162 us-gaap_IncomeLossFromContinuingOperations | $ 29,341 us-gaap_IncomeLossFromContinuingOperations | $ 17,974 us-gaap_IncomeLossFromContinuingOperations | $ 25,335 us-gaap_IncomeLossFromContinuingOperations | $ 32,653 us-gaap_IncomeLossFromContinuingOperations | $ 27,122 us-gaap_IncomeLossFromContinuingOperations | $ 22,305 us-gaap_IncomeLossFromContinuingOperations | $ 141,827 us-gaap_IncomeLossFromContinuingOperations | $ 107,415 us-gaap_IncomeLossFromContinuingOperations | $ 37,963 us-gaap_IncomeLossFromContinuingOperations
Loss on disposal of discontinued operations |  |  |  |  |  |  |  |  | 0 us-gaap_DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax | (997)us-gaap_DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax | 0 us-gaap_DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax
Net income | 41,350 us-gaap_NetIncomeLoss | 53,162 us-gaap_NetIncomeLoss | 29,341 us-gaap_NetIncomeLoss | 17,974 us-gaap_NetIncomeLoss | 25,335 us-gaap_NetIncomeLoss | 32,653 us-gaap_NetIncomeLoss | 27,122 us-gaap_NetIncomeLoss | 21,308 us-gaap_NetIncomeLoss | 141,827 us-gaap_NetIncomeLoss | 106,418 us-gaap_NetIncomeLoss | 37,963 us-gaap_NetIncomeLoss
Net income, basic shares |  |  |  |  |  |  |  |  | 56,310 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 55,638 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 54,880 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Basic net income from continuing operations |  |  |  |  |  |  |  |  | $ 2.52 us-gaap_IncomeLossFromContinuingOperationsPerBasicShare | $ 1.93 us-gaap_IncomeLossFromContinuingOperationsPerBasicShare | $ 0.69 us-gaap_IncomeLossFromContinuingOperationsPerBasicShare
Basic net loss from discontinued operations |  |  |  |  |  |  |  |  | $ 0.00 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare | $ (0.02)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare | $ 0.00 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare
Basic net income | $ 0.73 us-gaap_EarningsPerShareBasic | $ 0.94 us-gaap_EarningsPerShareBasic | $ 0.52 us-gaap_EarningsPerShareBasic | $ 0.32 us-gaap_EarningsPerShareBasic | $ 0.45 us-gaap_EarningsPerShareBasic | $ 0.59 us-gaap_EarningsPerShareBasic | $ 0.49 us-gaap_EarningsPerShareBasic | $ 0.38 us-gaap_EarningsPerShareBasic | $ 2.52 us-gaap_EarningsPerShareBasic | $ 1.91 us-gaap_EarningsPerShareBasic | $ 0.69 us-gaap_EarningsPerShareBasic
Effect of dilutive securities: [Abstract] |  |  |  |  |  |  |  |  |  |  |
Stock compensation plans, shares |  |  |  |  |  |  |  |  | 1,041 us-gaap_AmountOfDilutiveSecuritiesStockOptionsAndRestrictiveStockUnits | 1,172 us-gaap_AmountOfDilutiveSecuritiesStockOptionsAndRestrictiveStockUnits | 1,053 us-gaap_AmountOfDilutiveSecuritiesStockOptionsAndRestrictiveStockUnits
Earnings Per Share, Diluted [Abstract] |  |  |  |  |  |  |  |  |  |  |
Net income from continuing operations | 41,350 us-gaap_IncomeLossFromContinuingOperations | 53,162 us-gaap_IncomeLossFromContinuingOperations | 29,341 us-gaap_IncomeLossFromContinuingOperations | 17,974 us-gaap_IncomeLossFromContinuingOperations | 25,335 us-gaap_IncomeLossFromContinuingOperations | 32,653 us-gaap_IncomeLossFromContinuingOperations | 27,122 us-gaap_IncomeLossFromContinuingOperations | 22,305 us-gaap_IncomeLossFromContinuingOperations | 141,827 us-gaap_IncomeLossFromContinuingOperations | 107,415 us-gaap_IncomeLossFromContinuingOperations | 37,963 us-gaap_IncomeLossFromContinuingOperations
Loss on disposal of discontinued operations |  |  |  |  |  |  |  |  | 0 us-gaap_DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax | (997)us-gaap_DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax | 0 us-gaap_DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax
Net income | $ 41,350 us-gaap_NetIncomeLoss | $ 53,162 us-gaap_NetIncomeLoss | $ 29,341 us-gaap_NetIncomeLoss | $ 17,974 us-gaap_NetIncomeLoss | $ 25,335 us-gaap_NetIncomeLoss | $ 32,653 us-gaap_NetIncomeLoss | $ 27,122 us-gaap_NetIncomeLoss | $ 21,308 us-gaap_NetIncomeLoss | $ 141,827 us-gaap_NetIncomeLoss | $ 106,418 us-gaap_NetIncomeLoss | $ 37,963 us-gaap_NetIncomeLoss
Shares net income, Diluted |  |  |  |  |  |  |  |  | 57,351 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 56,810 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 55,933 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding
Diluted net income from continuing operations |  |  |  |  |  |  |  |  | $ 2.47 us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare | $ 1.89 us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare | $ 0.68 us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare
Diluted net loss from discontinued operations |  |  |  |  |  |  |  |  | $ 0.00 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare | $ (0.02)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare | $ 0.00 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare
Diluted net income | $ 0.72 us-gaap_EarningsPerShareDiluted | $ 0.93 us-gaap_EarningsPerShareDiluted | $ 0.51 us-gaap_EarningsPerShareDiluted | $ 0.31 us-gaap_EarningsPerShareDiluted | $ 0.44 us-gaap_EarningsPerShareDiluted | $ 0.57 us-gaap_EarningsPerShareDiluted | $ 0.48 us-gaap_EarningsPerShareDiluted | $ 0.38 us-gaap_EarningsPerShareDiluted | $ 2.47 us-gaap_EarningsPerShareDiluted | $ 1.87 us-gaap_EarningsPerShareDiluted | $ 0.68 us-gaap_EarningsPerShareDiluted

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