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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
Feb. 05, 2013
Dec. 31, 2012
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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