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Consolidated Statements of Changes in Shareholders' Equity (USD $)
In Thousands, unless otherwise specified
Total
Common Stock
Capital In Excess of Par Value
Accumulated Other Comprehensive Income
Retained Earnings
Beginning balances at Dec. 31, 2011 $ 1,947,017us-gaap_StockholdersEquity $ 9,541us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
$ 408,109us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember
$ 19,026us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedOtherComprehensiveIncomeMember
$ 1,510,341us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
Comprehensive income:          
Net income 23,176us-gaap_NetIncomeLoss 0us-gaap_NetIncomeLoss
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
0us-gaap_NetIncomeLoss
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember
0us-gaap_NetIncomeLoss
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedOtherComprehensiveIncomeMember
23,176us-gaap_NetIncomeLoss
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
Other comprehensive loss, net of tax (11,439)us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent 0us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
0us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember
(11,439)us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedOtherComprehensiveIncomeMember
0us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
Total comprehensive income 11,737us-gaap_ComprehensiveIncomeNetOfTax        
Activity in employee compensation plans 15,547us-gaap_StockGrantedDuringPeriodValueSharebasedCompensation 53us-gaap_StockGrantedDuringPeriodValueSharebasedCompensation
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
15,494us-gaap_StockGrantedDuringPeriodValueSharebasedCompensation
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember
0us-gaap_StockGrantedDuringPeriodValueSharebasedCompensation
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedOtherComprehensiveIncomeMember
0us-gaap_StockGrantedDuringPeriodValueSharebasedCompensation
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
Ending balances at Dec. 31, 2012 1,974,301us-gaap_StockholdersEquity 9,594us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
423,603us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember
7,587us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedOtherComprehensiveIncomeMember
1,533,517us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
Comprehensive income:          
Net income 184,746us-gaap_NetIncomeLoss 0us-gaap_NetIncomeLoss
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
0us-gaap_NetIncomeLoss
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember
0us-gaap_NetIncomeLoss
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedOtherComprehensiveIncomeMember
184,746us-gaap_NetIncomeLoss
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
Other comprehensive loss, net of tax (7,587)us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent 0us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
0us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember
(7,587)us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedOtherComprehensiveIncomeMember
0us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
Total comprehensive income 177,159us-gaap_ComprehensiveIncomeNetOfTax        
Activity in employee compensation plans 21,932us-gaap_StockGrantedDuringPeriodValueSharebasedCompensation 65us-gaap_StockGrantedDuringPeriodValueSharebasedCompensation
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
21,867us-gaap_StockGrantedDuringPeriodValueSharebasedCompensation
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember
0us-gaap_StockGrantedDuringPeriodValueSharebasedCompensation
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedOtherComprehensiveIncomeMember
0us-gaap_StockGrantedDuringPeriodValueSharebasedCompensation
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
Ending balances at Dec. 31, 2013 2,173,392us-gaap_StockholdersEquity 9,659us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
445,470us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember
0us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedOtherComprehensiveIncomeMember
1,718,263us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
Comprehensive income:          
Net income 136,276us-gaap_NetIncomeLoss 0us-gaap_NetIncomeLoss
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
0us-gaap_NetIncomeLoss
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember
0us-gaap_NetIncomeLoss
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedOtherComprehensiveIncomeMember
136,276us-gaap_NetIncomeLoss
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
Other comprehensive loss, net of tax       0us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedOtherComprehensiveIncomeMember
 
Total comprehensive income 136,276us-gaap_ComprehensiveIncomeNetOfTax        
Activity in employee compensation plans 22,726us-gaap_StockGrantedDuringPeriodValueSharebasedCompensation 73us-gaap_StockGrantedDuringPeriodValueSharebasedCompensation
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
22,653us-gaap_StockGrantedDuringPeriodValueSharebasedCompensation
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember
0us-gaap_StockGrantedDuringPeriodValueSharebasedCompensation
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedOtherComprehensiveIncomeMember
0us-gaap_StockGrantedDuringPeriodValueSharebasedCompensation
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
Ending balances at Dec. 31, 2014 $ 2,332,394us-gaap_StockholdersEquity $ 9,732us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
$ 468,123us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember
$ 0us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedOtherComprehensiveIncomeMember
$ 1,854,539us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember