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Share Repurchase (Details) (USD $)
Share data in Thousands, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Share Repurchase [Abstract]        
Stock Repurchase Program, Authorized Amount   $ 100,000,000    
Stock Repurchased During Period, Shares 691      
Stock Repurchased and Retired During Period, Value     (61,561,000) 0
Stock Repurchase Program, Remaining Authorized Repurchase Amount     $ 38,400,000