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Goodwill, Other Intangible Assets, and Other Assets (Goodwill) (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2013
Jun. 30, 2013
Dec. 31, 2012
Goodwill [Roll Forward]      
Balance as of December 31, 2012, as reported $ 256,821    
Reduction in goodwill resulting from a business acquisition purchase price allocation adjustment (7,661)    
Balance as of December 31, 2012, as revised, and June 30, 2013   $ 249,160 $ 249,160