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Goodwill and Intangible Assets Intangible Assests (Excluding Goodwill) (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Dec. 31, 2014
Schedule of Finite-lived and Indefinite-lived Intangible Assets [Line Items]      
Finite-Lived Intangible Assets, Gross $ 208,021us-gaap_FiniteLivedIntangibleAssetsGross   $ 210,677us-gaap_FiniteLivedIntangibleAssetsGross
Finite-Lived Intangible Assets, Accumulated Amortization (107,015)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization   (104,673)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
Amortization expense 4,404us-gaap_AmortizationOfIntangibleAssets 4,489us-gaap_AmortizationOfIntangibleAssets  
Finite-Lived Intangible Assets, Amortization Expense, Next Twelve Months 16,100us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths    
Finite-Lived Intangible Assets, Amortization Expense, Year Two 14,200us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo    
Finite-Lived Intangible Assets, Amortization Expense, Year Three 13,300us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearThree    
Finite-Lived Intangible Assets, Amortization Expense, Year Four 12,500us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFour    
Finite-Lived Intangible Assets, Amortization Expense, Year Five 12,400us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFive    
Trademarks and trade names      
Schedule of Finite-lived and Indefinite-lived Intangible Assets [Line Items]      
Indefinite-Lived Intangible Assets (Excluding Goodwill) 47,477us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill
/ us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_TrademarksAndTradeNamesMember
  47,662us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill
/ us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_TrademarksAndTradeNamesMember
Unpatented technology      
Schedule of Finite-lived and Indefinite-lived Intangible Assets [Line Items]      
Finite-Lived Intangible Assets, Gross 33,915us-gaap_FiniteLivedIntangibleAssetsGross
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_UnpatentedTechnologyMember
  35,933us-gaap_FiniteLivedIntangibleAssetsGross
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_UnpatentedTechnologyMember
Finite-Lived Intangible Assets, Accumulated Amortization (5,648)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_UnpatentedTechnologyMember
  (6,979)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_UnpatentedTechnologyMember
Patents      
Schedule of Finite-lived and Indefinite-lived Intangible Assets [Line Items]      
Finite-Lived Intangible Assets, Gross 7,766us-gaap_FiniteLivedIntangibleAssetsGross
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_PatentsMember
  7,809us-gaap_FiniteLivedIntangibleAssetsGross
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_PatentsMember
Finite-Lived Intangible Assets, Accumulated Amortization (6,377)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_PatentsMember
  (6,213)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_PatentsMember
Trademarks and trade names      
Schedule of Finite-lived and Indefinite-lived Intangible Assets [Line Items]      
Finite-Lived Intangible Assets, Gross 8,870us-gaap_FiniteLivedIntangibleAssetsGross
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_TrademarksAndTradeNamesMember
  8,981us-gaap_FiniteLivedIntangibleAssetsGross
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_TrademarksAndTradeNamesMember
Finite-Lived Intangible Assets, Accumulated Amortization (6,479)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_TrademarksAndTradeNamesMember
  (6,206)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_TrademarksAndTradeNamesMember
Non-compete agreements      
Schedule of Finite-lived and Indefinite-lived Intangible Assets [Line Items]      
Finite-Lived Intangible Assets, Gross 419us-gaap_FiniteLivedIntangibleAssetsGross
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_NoncompeteAgreementsMember
  421us-gaap_FiniteLivedIntangibleAssetsGross
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_NoncompeteAgreementsMember
Finite-Lived Intangible Assets, Accumulated Amortization (168)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_NoncompeteAgreementsMember
  (88)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_NoncompeteAgreementsMember
Customer relations      
Schedule of Finite-lived and Indefinite-lived Intangible Assets [Line Items]      
Finite-Lived Intangible Assets, Gross 157,051us-gaap_FiniteLivedIntangibleAssetsGross
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_CustomerRelationshipsMember
  157,533us-gaap_FiniteLivedIntangibleAssetsGross
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_CustomerRelationshipsMember
Finite-Lived Intangible Assets, Accumulated Amortization $ (88,343)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_CustomerRelationshipsMember
  $ (85,187)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_CustomerRelationshipsMember