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Consolidated Statements Of Stockholders' Equity (USD $)
In Thousands, except Share data, unless otherwise specified
Total
Common Stock
Treasury Stock
Retained Earnings
Accumulated Other Comprehensive Income (Loss)
BALANCE at Dec. 31, 2014 $ 97,378us-gaap_StockholdersEquity $ 473,592us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
$ (996,293)us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_TreasuryStockMember
$ 620,389us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
$ (310)us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedOtherComprehensiveIncomeMember
BALANCE (in shares) at Dec. 31, 2014 18,926,242us-gaap_CommonStockSharesOutstanding 18,926,242us-gaap_CommonStockSharesOutstanding
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
     
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Proceeds from exercise of stock options, net (in shares) 7,000us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised 6,825us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
     
Proceeds from exercise of stock options, net 339us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised 339us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
     
Adjustments related to tax withholding for share-based compensation (in shares)   (52,800)us-gaap_SharesPaidForTaxWithholdingForShareBasedCompensation
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
     
Adjustments related to tax withholding for share-based compensation (3,526)us-gaap_AdjustmentsRelatedToTaxWithholdingForShareBasedCompensation (3,526)us-gaap_AdjustmentsRelatedToTaxWithholdingForShareBasedCompensation
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
     
Share-based payments expense (in shares)   235,906us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensation
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
     
Share-based payments expense 6,239us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation 2,662us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
3,577us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_TreasuryStockMember
   
Excess tax benefit on share-based compensation expense 158us-gaap_AdjustmentsToAdditionalPaidInCapitalTaxEffectFromShareBasedCompensation 158us-gaap_AdjustmentsToAdditionalPaidInCapitalTaxEffectFromShareBasedCompensation
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
     
Repurchases of common stock (in shares) (617,195)us-gaap_TreasuryStockSharesAcquired        
Repurchases of common stock (40,708)us-gaap_TreasuryStockValueAcquiredCostMethod   (40,708)us-gaap_TreasuryStockValueAcquiredCostMethod
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_TreasuryStockMember
   
Net income 35,599us-gaap_NetIncomeLoss     35,599us-gaap_NetIncomeLoss
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
 
Dividends (Note 19) (5,602)us-gaap_Dividends     (5,602)us-gaap_Dividends
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
 
Foreign currency translation adjustment 2,854us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax [1],[2]       2,854us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedOtherComprehensiveIncomeMember
[3]
BALANCE at Mar. 31, 2015 $ 92,731us-gaap_StockholdersEquity $ 473,225us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
$ (1,033,424)us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_TreasuryStockMember
$ 650,386us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
$ 2,544us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedOtherComprehensiveIncomeMember
BALANCE (in shares) at Mar. 31, 2015 18,498,978us-gaap_CommonStockSharesOutstanding 18,498,978us-gaap_CommonStockSharesOutstanding
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
     
[1] Foreign currency translation adjustment had no tax effect in 2015.
[2] Foreign currency translation adjustment had no tax effect for the three months ended March 31, 2015 and 2014, respectively.
[3] Foreign currency translation adjustment has no tax effect for the three months ended March 31, 2015.