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Acquisitions (Narrative) (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Business Acquisition [Line Items]      
Goodwill $ 420,129us-gaap_Goodwill $ 496,810us-gaap_Goodwill $ 498,261us-gaap_Goodwill