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Goodwill and Intangible Assets Intangible Assets (Excluding Goodwill) (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Dec. 31, 2016
Schedule of Finite-lived and Indefinite-lived Intangible Assets [Line Items]      
Finite-Lived Intangible Assets, Gross [1],[2] $ 154,948   $ 146,309
Finite-Lived Intangible Assets, Accumulated Amortization [1],[2] (91,565)   (88,499)
Intangible Assets, Gross (Excluding Goodwill) 190,596   181,942
Amortization expense 2,986 $ 3,128  
Finite-Lived Intangible Assets, Amortization Expense, Remainder of Fiscal Year 11,700    
Finite-Lived Intangible Assets, Amortization Expense, Next Twelve Months 10,600    
Finite-Lived Intangible Assets, Amortization Expense, Year Two 10,600    
Finite-Lived Intangible Assets, Amortization Expense, Year Three 9,000    
Finite-Lived Intangible Assets, Amortization Expense, Year Four 2,900    
Trademarks and trade names      
Schedule of Finite-lived and Indefinite-lived Intangible Assets [Line Items]      
Indefinite-Lived Intangible Assets (Excluding Goodwill) 35,648   35,633
Unpatented technology      
Schedule of Finite-lived and Indefinite-lived Intangible Assets [Line Items]      
Finite-Lived Intangible Assets, Gross 8,222   8,186
Finite-Lived Intangible Assets, Accumulated Amortization (3,309)   (3,132)
Patents and other      
Schedule of Finite-lived and Indefinite-lived Intangible Assets [Line Items]      
Finite-Lived Intangible Assets, Gross 1,882   1,235
Finite-Lived Intangible Assets, Accumulated Amortization (743)   (695)
Trademarks and trade names      
Schedule of Finite-lived and Indefinite-lived Intangible Assets [Line Items]      
Finite-Lived Intangible Assets, Gross 5,280   4,918
Finite-Lived Intangible Assets, Accumulated Amortization (2,369)   (2,198)
Customer Relationships [Member]      
Schedule of Finite-lived and Indefinite-lived Intangible Assets [Line Items]      
Finite-Lived Intangible Assets, Gross 126,845   119,320
Finite-Lived Intangible Assets, Accumulated Amortization (84,215)   (81,614)
Land use rights      
Schedule of Finite-lived and Indefinite-lived Intangible Assets [Line Items]      
Finite-Lived Intangible Assets, Gross 12,719   12,650
Finite-Lived Intangible Assets, Accumulated Amortization $ (929)   $ (860)
[1] Amounts include the impact of foreign currency translation. Fully amortized amounts are written off.
[2] The Company amortizes certain identifiable intangible assets primarily on a straight-line basis over their estimated useful lives, which range from one to 50 years.