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Consolidated Statements of Shareholders' Equity (USD $) In Thousands, unless otherwise specified | Total | Common Stock [Member] | Capital in Excess of Par Value [Member] | Retained Earnings [Member] | Accumulated Other Comprehensive Loss [Member] | Treasury Stock [Member]
--- | --- | --- | --- | --- | --- | ---
Beginning Balance at Dec. 31, 2011 | $ 490,404 us-gaap_StockholdersEquity | $ 544 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | $ 51,477 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_OtherAdditionalCapitalMember | $ 775,825 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | $ (166,741)us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | $ (170,701)us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember
Net income | 59,379 us-gaap_NetIncomeLoss |  |  | 59,379 us-gaap_NetIncomeLoss / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |  |
Other comprehensive income (loss) | 2,775 us-gaap_OtherComprehensiveIncomeLossNetOfTax |  |  |  | 2,775 us-gaap_OtherComprehensiveIncomeLossNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember |
Comprehensive income (loss) | 62,154 us-gaap_ComprehensiveIncomeNetOfTax |  |  |  |  |
Tax effect on exercise of stock awards | 631 us-gaap_AdjustmentToAdditionalPaidInCapitalIncomeTaxEffectFromShareBasedCompensationNet |  | 631 us-gaap_AdjustmentToAdditionalPaidInCapitalIncomeTaxEffectFromShareBasedCompensationNet / us-gaap_StatementEquityComponentsAxis = us-gaap_OtherAdditionalCapitalMember |  |  |
Cash dividends declared ($0.36, $0.40 and $0.44 per share at 2012, 2013 and 2014 respectively) | (15,611)us-gaap_DividendsCommonStockCash |  |  | (15,611)us-gaap_DividendsCommonStockCash / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |  |
Share-based compensation expense | 3,970 us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue |  | 3,970 us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue / us-gaap_StatementEquityComponentsAxis = us-gaap_OtherAdditionalCapitalMember |  |  |
Repurchase of common shares | (5,675)us-gaap_TreasuryStockValueAcquiredCostMethod |  |  |  |  | (5,675)us-gaap_TreasuryStockValueAcquiredCostMethod / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember
Delivery of treasury shares |  |  |  |  |  |
RSUs | (337)us-gaap_StockIssuedDuringPeriodValueRestrictedStockAwardGross |  | (1,433)us-gaap_StockIssuedDuringPeriodValueRestrictedStockAwardGross / us-gaap_StatementEquityComponentsAxis = us-gaap_OtherAdditionalCapitalMember |  |  | 1,096 us-gaap_StockIssuedDuringPeriodValueRestrictedStockAwardGross / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember
401 (k) plans | 2,446 us-gaap_StockIssuedDuringPeriodValueEmployeeBenefitPlan |  | 234 us-gaap_StockIssuedDuringPeriodValueEmployeeBenefitPlan / us-gaap_StatementEquityComponentsAxis = us-gaap_OtherAdditionalCapitalMember |  |  | 2,212 us-gaap_StockIssuedDuringPeriodValueEmployeeBenefitPlan / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember
Employee stock options exercised - net | 1,697 us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised |  | (2,387)us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised / us-gaap_StatementEquityComponentsAxis = us-gaap_OtherAdditionalCapitalMember |  |  | 4,084 us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember
Ending Balance at Dec. 31, 2012 | 539,679 us-gaap_StockholdersEquity | 544 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 52,492 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_OtherAdditionalCapitalMember | 819,593 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | (163,966)us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | (168,984)us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember
Net income | 67,158 us-gaap_NetIncomeLoss |  |  | 67,158 us-gaap_NetIncomeLoss / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |  |
Other comprehensive income (loss) | 88,609 us-gaap_OtherComprehensiveIncomeLossNetOfTax |  |  |  | 88,609 us-gaap_OtherComprehensiveIncomeLossNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember |
Comprehensive income (loss) | 155,767 us-gaap_ComprehensiveIncomeNetOfTax |  |  |  |  |
Tax effect on exercise of stock awards | 1,451 us-gaap_AdjustmentToAdditionalPaidInCapitalIncomeTaxEffectFromShareBasedCompensationNet |  | 1,451 us-gaap_AdjustmentToAdditionalPaidInCapitalIncomeTaxEffectFromShareBasedCompensationNet / us-gaap_StatementEquityComponentsAxis = us-gaap_OtherAdditionalCapitalMember |  |  |
Cash dividends declared ($0.36, $0.40 and $0.44 per share at 2012, 2013 and 2014 respectively) | (17,422)us-gaap_DividendsCommonStockCash |  |  | (17,422)us-gaap_DividendsCommonStockCash / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |  |
Share-based compensation expense | 4,473 us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue |  | 4,473 us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue / us-gaap_StatementEquityComponentsAxis = us-gaap_OtherAdditionalCapitalMember |  |  |
Delivery of treasury shares |  |  |  |  |  |
RSUs | (529)us-gaap_StockIssuedDuringPeriodValueRestrictedStockAwardGross |  | (1,763)us-gaap_StockIssuedDuringPeriodValueRestrictedStockAwardGross / us-gaap_StatementEquityComponentsAxis = us-gaap_OtherAdditionalCapitalMember |  |  | 1,234 us-gaap_StockIssuedDuringPeriodValueRestrictedStockAwardGross / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember
401 (k) plans | 2,890 us-gaap_StockIssuedDuringPeriodValueEmployeeBenefitPlan |  | 1,099 us-gaap_StockIssuedDuringPeriodValueEmployeeBenefitPlan / us-gaap_StatementEquityComponentsAxis = us-gaap_OtherAdditionalCapitalMember |  |  | 1,791 us-gaap_StockIssuedDuringPeriodValueEmployeeBenefitPlan / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember
Employee stock options exercised - net | (1,833)us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised |  | (3,812)us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised / us-gaap_StatementEquityComponentsAxis = us-gaap_OtherAdditionalCapitalMember |  |  | 1,979 us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember
Ending Balance at Dec. 31, 2013 | 684,476 us-gaap_StockholdersEquity | 544 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 53,940 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_OtherAdditionalCapitalMember | 869,329 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | (75,357)us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | (163,980)us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember
Net income | 69,246 us-gaap_NetIncomeLoss |  |  | 69,246 us-gaap_NetIncomeLoss / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |  |
Other comprehensive income (loss) | (79,513)us-gaap_OtherComprehensiveIncomeLossNetOfTax |  |  |  | (79,513)us-gaap_OtherComprehensiveIncomeLossNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember |
Comprehensive income (loss) | (10,267)us-gaap_ComprehensiveIncomeNetOfTax |  |  |  |  |
Tax effect on exercise of stock awards | (14)us-gaap_AdjustmentToAdditionalPaidInCapitalIncomeTaxEffectFromShareBasedCompensationNet |  | (14)us-gaap_AdjustmentToAdditionalPaidInCapitalIncomeTaxEffectFromShareBasedCompensationNet / us-gaap_StatementEquityComponentsAxis = us-gaap_OtherAdditionalCapitalMember |  |  |
Cash dividends declared ($0.36, $0.40 and $0.44 per share at 2012, 2013 and 2014 respectively) | (19,107)us-gaap_DividendsCommonStockCash |  |  | (19,107)us-gaap_DividendsCommonStockCash / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |  |
Share-based compensation expense | 4,738 us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue |  | 4,738 us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue / us-gaap_StatementEquityComponentsAxis = us-gaap_OtherAdditionalCapitalMember |  |  |
Repurchase of common shares | (12,180)us-gaap_TreasuryStockValueAcquiredCostMethod |  |  |  |  | (12,180)us-gaap_TreasuryStockValueAcquiredCostMethod / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember
Delivery of treasury shares |  |  |  |  |  |
RSUs | (1,758)us-gaap_StockIssuedDuringPeriodValueRestrictedStockAwardGross |  | (4,121)us-gaap_StockIssuedDuringPeriodValueRestrictedStockAwardGross / us-gaap_StatementEquityComponentsAxis = us-gaap_OtherAdditionalCapitalMember |  |  | 2,363 us-gaap_StockIssuedDuringPeriodValueRestrictedStockAwardGross / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember
401 (k) plans | 3,093 us-gaap_StockIssuedDuringPeriodValueEmployeeBenefitPlan |  | 1,318 us-gaap_StockIssuedDuringPeriodValueEmployeeBenefitPlan / us-gaap_StatementEquityComponentsAxis = us-gaap_OtherAdditionalCapitalMember |  |  | 1,775 us-gaap_StockIssuedDuringPeriodValueEmployeeBenefitPlan / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember
Employee stock options exercised - net | 128 us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised |  | (1,519)us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised / us-gaap_StatementEquityComponentsAxis = us-gaap_OtherAdditionalCapitalMember |  |  | 1,647 us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember
Ending Balance at Dec. 31, 2014 | $ 649,109 us-gaap_StockholdersEquity | $ 544 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | $ 54,342 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_OtherAdditionalCapitalMember | $ 919,468 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | $ (154,870)us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | $ (170,375)us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember

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