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Share Repurchase Program Share Repurchse Program (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
0 Months Ended 6 Months Ended
Jan. 01, 2004
Jun. 30, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Stock Repurchase Program, Authorized Amount $ 20,000 $ 125,000
Stock Repurchased During Period, Shares   707,830
Stock Repurchased During Period, Value   32,763
Stock Repurchase Program, Remaining Authorized Repurchase Amount   $ 139,327
Repurchase of Equity [Member]
   
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Share Price   $ 46.29