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Goodwill and Other Intangible Assets (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Mar. 31, 2011
Goodwill [Roll Forward]      
Goodwill, Beginning $ 452,351 $ 447,743 $ 4,400
Goodwill, Acquired During Period 1,049 648  
Goodwill, Translation Adjustments 2,442 3,960  
Goodwill, Ending $ 455,842 $ 452,351 $ 4,400