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Statements Of Changes In Shareholders' Equity (USD $) In Thousands, except Share data | Total | Common Stock [Member] | Retained Earnings [Member] | Capital In Excess Of Par Value [Member]
--- | --- | --- | --- | ---
Balance at Dec. 31, 2011 | $ 856,519 us-gaap_StockholdersEquity | $ 8,616 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | $ 713,500 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | $ 134,403 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember
Balance, in shares at Dec. 31, 2011 |  | 86,165,000 us-gaap_SharesIssued / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |
Net income | 169,452 us-gaap_NetIncomeLoss |  | 169,452 us-gaap_NetIncomeLoss / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |
Adjustments to Additional Paid in Capital, Other | (2)us-gaap_AdjustmentsToAdditionalPaidInCapitalOther |  |  | (2)us-gaap_AdjustmentsToAdditionalPaidInCapitalOther / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember
Balance at Dec. 31, 2012 | 1,025,969 us-gaap_StockholdersEquity | 8,616 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 882,952 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | 134,401 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember
Balance, in shares at Dec. 31, 2012 |  | 86,165,000 us-gaap_SharesIssued / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |
Net income | 206,113 us-gaap_NetIncomeLoss |  | 206,113 us-gaap_NetIncomeLoss / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |
Balance at Dec. 31, 2013 | 1,232,082 us-gaap_StockholdersEquity | 8,616 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 1,089,065 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | 134,401 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember
Balance, in shares at Dec. 31, 2013 |  | 86,165,000 us-gaap_SharesIssued / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |
Net income | 267,514 us-gaap_NetIncomeLoss |  | 267,514 us-gaap_NetIncomeLoss / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |
Stock Repurchased During Period, Shares | (70,620)us-gaap_StockRepurchasedAndRetiredDuringPeriodShares | (71,000)us-gaap_StockRepurchasedAndRetiredDuringPeriodShares / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |
Stock Repurchased and Retired During Period, Value | 5,532 us-gaap_StockRepurchasedAndRetiredDuringPeriodValue | 7 us-gaap_StockRepurchasedAndRetiredDuringPeriodValue / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 5,525 us-gaap_StockRepurchasedAndRetiredDuringPeriodValue / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |
Balance at Dec. 31, 2014 | $ 1,494,064 us-gaap_StockholdersEquity | $ 8,609 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | $ 1,351,054 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | $ 134,401 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember
Balance, in shares at Dec. 31, 2014 |  | 86,094,000 us-gaap_SharesIssued / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |

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- Definition Amount of other increase (decrease) in additional paid in capital (APIC). + References No definition available. + Details
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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644 + Details
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