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Goodwill and Other Intangible Assets (Schedule of intangible assets subject to amortization) (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Finite-lived Intangible Assets [Roll Forward] |  |  |
Intangible assets subject to amortization, beginning balance | $ 111,010 us-gaap_FiniteLivedIntangibleAssetsNet | $ 98,296 us-gaap_FiniteLivedIntangibleAssetsNet |
Intangible assets acquired during the year | 0 us-gaap_FinitelivedIntangibleAssetsAcquired1 | 36,980 us-gaap_FinitelivedIntangibleAssetsAcquired1 |
Amortization during the year | (24,724)us-gaap_AmortizationOfIntangibleAssets | (26,250)us-gaap_AmortizationOfIntangibleAssets | (57,463)us-gaap_AmortizationOfIntangibleAssets
Currency translation during the year | (6,968)us-gaap_FiniteLivedIntangibleAssetsTranslationAndPurchaseAccountingAdjustments | 1,984 us-gaap_FiniteLivedIntangibleAssetsTranslationAndPurchaseAccountingAdjustments |
Intangible assets subject to amortization, ending balance | 79,318 us-gaap_FiniteLivedIntangibleAssetsNet | 111,010 us-gaap_FiniteLivedIntangibleAssetsNet | 98,296 us-gaap_FiniteLivedIntangibleAssetsNet
Customer Relationships [Member] |  |  |
Finite-lived Intangible Assets [Roll Forward] |  |  |
Intangible assets subject to amortization, beginning balance | 40,998 us-gaap_FiniteLivedIntangibleAssetsNet / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerRelationshipsMember | 26,210 us-gaap_FiniteLivedIntangibleAssetsNet / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerRelationshipsMember |
Intangible assets acquired during the year | 0 us-gaap_FinitelivedIntangibleAssetsAcquired1 / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerRelationshipsMember | 21,792 us-gaap_FinitelivedIntangibleAssetsAcquired1 / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerRelationshipsMember |
Amortization during the year | (6,901)us-gaap_AmortizationOfIntangibleAssets / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerRelationshipsMember | (6,456)us-gaap_AmortizationOfIntangibleAssets / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerRelationshipsMember |
Currency translation during the year | (180)us-gaap_FiniteLivedIntangibleAssetsTranslationAndPurchaseAccountingAdjustments / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerRelationshipsMember | (548)us-gaap_FiniteLivedIntangibleAssetsTranslationAndPurchaseAccountingAdjustments / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerRelationshipsMember |
Intangible assets subject to amortization, ending balance | 33,917 us-gaap_FiniteLivedIntangibleAssetsNet / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerRelationshipsMember | 40,998 us-gaap_FiniteLivedIntangibleAssetsNet / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerRelationshipsMember |
Patents [Member] |  |  |
Finite-lived Intangible Assets [Roll Forward] |  |  |
Intangible assets subject to amortization, beginning balance | 69,071 us-gaap_FiniteLivedIntangibleAssetsNet / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_PatentsMember | 71,031 us-gaap_FiniteLivedIntangibleAssetsNet / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_PatentsMember |
Intangible assets acquired during the year | 0 us-gaap_FinitelivedIntangibleAssetsAcquired1 / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_PatentsMember | 15,188 us-gaap_FinitelivedIntangibleAssetsAcquired1 / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_PatentsMember |
Amortization during the year | (17,700)us-gaap_AmortizationOfIntangibleAssets / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_PatentsMember | (19,336)us-gaap_AmortizationOfIntangibleAssets / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_PatentsMember |
Currency translation during the year | (6,780)us-gaap_FiniteLivedIntangibleAssetsTranslationAndPurchaseAccountingAdjustments / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_PatentsMember | 2,188 us-gaap_FiniteLivedIntangibleAssetsTranslationAndPurchaseAccountingAdjustments / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_PatentsMember |
Intangible assets subject to amortization, ending balance | 44,591 us-gaap_FiniteLivedIntangibleAssetsNet / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_PatentsMember | 69,071 us-gaap_FiniteLivedIntangibleAssetsNet / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_PatentsMember |
Other [Member] |  |  |
Finite-lived Intangible Assets [Roll Forward] |  |  |
Intangible assets subject to amortization, beginning balance | 941 us-gaap_FiniteLivedIntangibleAssetsNet / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_OtherCreditDerivativesMember | 1,055 us-gaap_FiniteLivedIntangibleAssetsNet / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_OtherCreditDerivativesMember |
Intangible assets acquired during the year | 0 us-gaap_FinitelivedIntangibleAssetsAcquired1 / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_OtherCreditDerivativesMember | 0 us-gaap_FinitelivedIntangibleAssetsAcquired1 / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_OtherCreditDerivativesMember |
Amortization during the year | (123)us-gaap_AmortizationOfIntangibleAssets / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_OtherCreditDerivativesMember | (458)us-gaap_AmortizationOfIntangibleAssets / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_OtherCreditDerivativesMember |
Currency translation during the year | (8)us-gaap_FiniteLivedIntangibleAssetsTranslationAndPurchaseAccountingAdjustments / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_OtherCreditDerivativesMember | 344 us-gaap_FiniteLivedIntangibleAssetsTranslationAndPurchaseAccountingAdjustments / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_OtherCreditDerivativesMember |
Intangible assets subject to amortization, ending balance | $ 810 us-gaap_FiniteLivedIntangibleAssetsNet / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_OtherCreditDerivativesMember | $ 941 us-gaap_FiniteLivedIntangibleAssetsNet / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_OtherCreditDerivativesMember |

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