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Shareholders' Equity (Details) (USD $) In Thousands, unless otherwise specified | 0 Months Ended | 12 Months Ended | 0 Months Ended | 12 Months Ended
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Feb. 05, 2013 | Dec. 31, 2012 item | Dec. 31, 2011 | Dec. 31, 2010 | Nov. 20, 2012 Accelerated Share Repurchase Transaction [Member] | Dec. 31, 2012 Repurchases in Accordance with Stock Award Agreements [Member] | Dec. 31, 2010 Repurchases in Accordance with Stock Award Agreements [Member] | Dec. 31, 2012 Share Repurchase Plans, including Accelerated Share Repurchase [Member] | Dec. 31, 2011 Share Repurchase Plans, including Accelerated Share Repurchase [Member] | Dec. 31, 2010 Share Repurchase Plans, including Accelerated Share Repurchase [Member]
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |  |  |  |
Number of plans authorized to repurchase shares of common stock |  | 6 |  |  |  |  |  |  |  |
Stock repurchase program, authorized amount | $ 100,000 | $ 600,000 |  |  | $ 25,000 |  |  |  |  |
Acquisition of treasury stock (shares), total |  |  |  |  | 65 | 28 | 67 | 686 | 220 | 828
Acquisition of treasury stock (value), total |  | 217,092 | 63,508 | 126,602 |  | 10,698 | 10,717 | 206,394 | 63,508 | 115,885
Advance payment under agreement |  |  |  |  | 25,000 |  |  |  |  |
Percentage of Treasury Shares Acquired |  |  |  |  | 70.00% |  |  |  |  |
Shares held in treasury, reissued or retired |  | 3,819 |  |  |  |  |  |  |  |
Value of common shares remaining to be repurchased |  | $ 100,179 |  |  |  |  |  |  |  |

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- Definition Amount of cash payment to or cash receipt from the bank; or the stock issuance to or stock received from the bank in the settlement of the accelerated share repurchase agreement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Emerging Issues Task Force (EITF) -Number 99-7 -Paragraph 1 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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