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Consolidated Statements of Changes In Shareholders' Equity (USD $) In Thousands, unless otherwise specified | Total | Class A Common Stock | Class B Common Stock | Common Stock | Common Stock Class A Common Stock | Common Stock Class B Common Stock | Surplus | Surplus Class A Common Stock | Surplus Class B Common Stock | Retained Earnings [Member] | Retained Earnings [Member] Class A Common Stock | Retained Earnings [Member] Class B Common Stock | Accumulated Other Comprehensive Loss | Accumulated Other Comprehensive Loss Class A Common Stock | Accumulated Other Comprehensive Loss Class B Common Stock
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Beginning balance at Dec. 31, 2011 | $ 1,861,128us-gaap_StockholdersEquity |  |  |  | $ 8,644us-gaap_StockholdersEquity / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | $ 1,640us-gaap_StockholdersEquity / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassBMember / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | $ 143,766us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  | $ 1,773,652us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |  |  | $ (66,574)us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cumulative effect of accounting change | (2,430)us-gaap_CumulativeEffectOfProspectiveApplicationOfNewAccountingPrinciple |  |  |  |  |  |  |  |  | (2,430)us-gaap_CumulativeEffectOfProspectiveApplicationOfNewAccountingPrinciple / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |  |  |  |  |
Net income | 132,395us-gaap_NetIncomeLoss |  |  |  | 0us-gaap_NetIncomeLoss / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 0us-gaap_NetIncomeLoss / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassBMember / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 0us-gaap_NetIncomeLoss / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  | 132,395us-gaap_NetIncomeLoss / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |  |  | 0us-gaap_NetIncomeLoss / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember |  |
Net current period other comprehensive income | (15,532)us-gaap_OtherComprehensiveIncomeLossNetOfTax |  |  |  | 0us-gaap_OtherComprehensiveIncomeLossNetOfTax / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 0us-gaap_OtherComprehensiveIncomeLossNetOfTax / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassBMember / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 0us-gaap_OtherComprehensiveIncomeLossNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  | 0us-gaap_OtherComprehensiveIncomeLossNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |  |  | (15,532)us-gaap_OtherComprehensiveIncomeLossNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember |  |
Repurchase of common stock shares |  | (9,131)us-gaap_StockRepurchasedDuringPeriodValue / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember | (94,493)us-gaap_StockRepurchasedDuringPeriodValue / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassBMember |  | (56)us-gaap_StockRepurchasedDuringPeriodValue / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | (607)us-gaap_StockRepurchasedDuringPeriodValue / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassBMember / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  | 0us-gaap_StockRepurchasedDuringPeriodValue / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember | 0us-gaap_StockRepurchasedDuringPeriodValue / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassBMember / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  | (9,075)us-gaap_StockRepurchasedDuringPeriodValue / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | (93,886)us-gaap_StockRepurchasedDuringPeriodValue / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassBMember / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |  | 0us-gaap_StockRepurchasedDuringPeriodValue / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | 0us-gaap_StockRepurchasedDuringPeriodValue / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassBMember / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember
Repurchase and retirement of common stock | 0us-gaap_StockRepurchasedAndRetiredDuringPeriodValue |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash dividends | (12,313)us-gaap_DividendsCommonStockCash |  |  |  | 0us-gaap_DividendsCommonStockCash / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 0us-gaap_DividendsCommonStockCash / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassBMember / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 0us-gaap_DividendsCommonStockCash / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  | (12,313)us-gaap_DividendsCommonStockCash / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |  |  | 0us-gaap_DividendsCommonStockCash / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember |  |
Ending balance at Dec. 31, 2012 | 1,859,624us-gaap_StockholdersEquity |  |  |  | 8,588us-gaap_StockholdersEquity / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 1,033us-gaap_StockholdersEquity / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassBMember / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 143,766us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  | 1,788,343us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |  |  | (82,106)us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income | 166,869us-gaap_NetIncomeLoss |  |  |  | 0us-gaap_NetIncomeLoss / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 0us-gaap_NetIncomeLoss / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassBMember / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 0us-gaap_NetIncomeLoss / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  | 166,869us-gaap_NetIncomeLoss / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |  |  | 0us-gaap_NetIncomeLoss / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember |  |
Net current period other comprehensive income | 56,838us-gaap_OtherComprehensiveIncomeLossNetOfTax |  |  |  | 0us-gaap_OtherComprehensiveIncomeLossNetOfTax / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 0us-gaap_OtherComprehensiveIncomeLossNetOfTax / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassBMember / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 0us-gaap_OtherComprehensiveIncomeLossNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  | 0us-gaap_OtherComprehensiveIncomeLossNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |  |  | 56,838us-gaap_OtherComprehensiveIncomeLossNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember |  |
Repurchase of common stock shares |  | (321)us-gaap_StockRepurchasedDuringPeriodValue / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember |  |  | (2)us-gaap_StockRepurchasedDuringPeriodValue / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  | 0us-gaap_StockRepurchasedDuringPeriodValue / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  | (319)us-gaap_StockRepurchasedDuringPeriodValue / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |  |  | 0us-gaap_StockRepurchasedDuringPeriodValue / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember |
Repurchase and retirement of common stock | 0us-gaap_StockRepurchasedAndRetiredDuringPeriodValue |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash dividends | (11,548)us-gaap_DividendsCommonStockCash |  |  |  | 0us-gaap_DividendsCommonStockCash / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 0us-gaap_DividendsCommonStockCash / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassBMember / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 0us-gaap_DividendsCommonStockCash / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  | (11,548)us-gaap_DividendsCommonStockCash / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |  |  | 0us-gaap_DividendsCommonStockCash / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember |  |
Ending balance at Dec. 31, 2013 | 2,071,462us-gaap_StockholdersEquity |  |  |  | 8,586us-gaap_StockholdersEquity / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 1,033us-gaap_StockholdersEquity / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassBMember / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 143,766us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  | 1,943,345us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |  |  | (25,268)us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income | 138,562us-gaap_NetIncomeLoss |  |  |  | 0us-gaap_NetIncomeLoss / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 0us-gaap_NetIncomeLoss / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassBMember / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 0us-gaap_NetIncomeLoss / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  | 138,562us-gaap_NetIncomeLoss / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |  |  | 0us-gaap_NetIncomeLoss / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember |  |
Net current period other comprehensive income | (27,713)us-gaap_OtherComprehensiveIncomeLossNetOfTax |  |  |  | 0us-gaap_OtherComprehensiveIncomeLossNetOfTax / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 0us-gaap_OtherComprehensiveIncomeLossNetOfTax / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassBMember / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 0us-gaap_OtherComprehensiveIncomeLossNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  | 0us-gaap_OtherComprehensiveIncomeLossNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |  |  | (27,713)us-gaap_OtherComprehensiveIncomeLossNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember |  |
Stock Issued During Period, Value, New Issues | 563,628us-gaap_StockIssuedDuringPeriodValueNewIssues |  |  |  | 2,587us-gaap_StockIssuedDuringPeriodValueNewIssues / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 18us-gaap_StockIssuedDuringPeriodValueNewIssues / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassBMember / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 561,023us-gaap_StockIssuedDuringPeriodValueNewIssues / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  | 0us-gaap_StockIssuedDuringPeriodValueNewIssues / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |  |  | 0us-gaap_StockIssuedDuringPeriodValueNewIssues / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember |  |
Repurchase and retirement of common stock | 46,085us-gaap_StockRepurchasedAndRetiredDuringPeriodValue | 36,308us-gaap_StockRepurchasedAndRetiredDuringPeriodValue / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember | 9,777us-gaap_StockRepurchasedAndRetiredDuringPeriodValue / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassBMember | 0us-gaap_StockRepurchasedAndRetiredDuringPeriodValue / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 168us-gaap_StockRepurchasedAndRetiredDuringPeriodValue / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 46us-gaap_StockRepurchasedAndRetiredDuringPeriodValue / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassBMember / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  | 36,140us-gaap_StockRepurchasedAndRetiredDuringPeriodValue / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember | 9,731us-gaap_StockRepurchasedAndRetiredDuringPeriodValue / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassBMember / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  | 0us-gaap_StockRepurchasedAndRetiredDuringPeriodValue / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | 0us-gaap_StockRepurchasedAndRetiredDuringPeriodValue / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassBMember / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |  | 0us-gaap_StockRepurchasedAndRetiredDuringPeriodValue / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | 0us-gaap_StockRepurchasedAndRetiredDuringPeriodValue / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassBMember / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember
Cash dividends | (12,260)us-gaap_DividendsCommonStockCash |  |  |  | 0us-gaap_DividendsCommonStockCash / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 0us-gaap_DividendsCommonStockCash / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassBMember / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 0us-gaap_DividendsCommonStockCash / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  | (12,260)us-gaap_DividendsCommonStockCash / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |  |  | 0us-gaap_DividendsCommonStockCash / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember |  |
Ending balance at Dec. 31, 2014 | $ 2,687,594us-gaap_StockholdersEquity |  |  |  | $ 11,005us-gaap_StockholdersEquity / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | $ 1,005us-gaap_StockholdersEquity / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassBMember / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | $ 658,918us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  | $ 2,069,647us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |  |  | $ (52,981)us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember |  |

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- Definition Equity impact of the value of stock that has been repurchased and retired during the period. The excess of the purchase price over par value can be charged against retained earnings (once the excess is fully allocated to additional paid in capital). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 Reference 2: 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 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 29, 30, 31 -Article 5 + Details
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