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Consolidated Statement of Stockholders' Equity (USD $) In Thousands	Total	Common Stock [Member]	Treasury Stock [Member]	Additional Paid-in Capital [Member]	Accumulated Other Comprehensive Loss [Member]	Retained Earnings [Member]
Beginning Balance at Dec. 31, 2014	$ 476,232us-gaap_StockholdersEquity	$ 497us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember	$ (53,770)us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember	$ 158,549us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember	$ (35)us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember	$ 370,991us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember
Beginning Balance, Shares at Dec. 31, 2014		49,746us-gaap_SharesIssued / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember	3,002us-gaap_SharesIssued / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember
Comprehensive income	33,945us-gaap_ComprehensiveIncomeNetOfTax				(234)us-gaap_ComprehensiveIncomeNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember	34,179us-gaap_ComprehensiveIncomeNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember
Restricted shares forfeited	0us-gaap_StockIssuedDuringPeriodValueRestrictedStockAwardForfeitures	0us-gaap_StockIssuedDuringPeriodValueRestrictedStockAwardForfeitures / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember	0us-gaap_StockIssuedDuringPeriodValueRestrictedStockAwardForfeitures / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember	0us-gaap_StockIssuedDuringPeriodValueRestrictedStockAwardForfeitures / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember	0us-gaap_StockIssuedDuringPeriodValueRestrictedStockAwardForfeitures / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember	0us-gaap_StockIssuedDuringPeriodValueRestrictedStockAwardForfeitures / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember
Restricted shares forfeited, Shares			3us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardForfeited / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember
Exercise of stock options	1,735us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised	2us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember		1,733us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember
Exercise of stock options, Shares		105us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember
Excess tax benefits	2,870us-gaap_AdjustmentsToAdditionalPaidInCapitalTaxEffectFromShareBasedCompensation			2,870us-gaap_AdjustmentsToAdditionalPaidInCapitalTaxEffectFromShareBasedCompensation / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember
Share-based compensation	(1,593)us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation	3us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember	(4,178)us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember	2,582us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember
Share-based compensation, Shares		313us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember	91us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember
Ending Balance at Mar. 31, 2015	$ 513,189us-gaap_StockholdersEquity	$ 502us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember	$ (57,948)us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember	$ 165,734us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember	$ (269)us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember	$ 405,170us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember
Ending Balance, Shares at Mar. 31, 2015		50,164us-gaap_SharesIssued / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember	3,096us-gaap_SharesIssued / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember

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- Definition

Amount of increase in additional paid in capital (APIC) resulting from a tax benefit associated with share-based compensation plan other than an employee stock ownership plan (ESOP). Includes, but is not limited to, excess tax benefit.

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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.

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The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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Number of shares of stock issued as of the balance sheet date, including shares that had been issued and were previously outstanding but which are now held in the treasury.

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Total of all stockholders' equity (deficit) items, net of receivables from officers, directors, owners, and affiliates of the entity which are attributable to the parent. The amount of the economic entity's stockholders' equity attributable to the parent excludes the amount of stockholders' equity which is allocable to that ownership interest in subsidiary equity which is not attributable to the parent (noncontrolling interest, minority interest). This excludes temporary equity and is sometimes called permanent equity.

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