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Goodwill and Other Intangible Assets - Acquired Intangible Assets (Details) (USD $)
 3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Dec. 31, 2014
Indefinite-lived Intangible Assets [Line Items]      
Intangible assets amortization expense $ 1,500,000us-gaap_AmortizationOfIntangibleAssets $ 1,500,000us-gaap_AmortizationOfIntangibleAssets  
Gross Carrying Amount 72,855,000us-gaap_IntangibleAssetsGrossExcludingGoodwill   71,455,000us-gaap_IntangibleAssetsGrossExcludingGoodwill
Other intangible assets, net 35,528,000us-gaap_IntangibleAssetsNetExcludingGoodwill   35,623,000us-gaap_IntangibleAssetsNetExcludingGoodwill
Licensing Agreements [Member]      
Indefinite-lived Intangible Assets [Line Items]      
Gross Carrying Amount 1,400,000us-gaap_IntangibleAssetsGrossExcludingGoodwill
/ us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_LicensingAgreementsMember		    
Other intangible assets, net $ 1,400,000us-gaap_IntangibleAssetsNetExcludingGoodwill
/ us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_LicensingAgreementsMember