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Goodwill and Intangible Assets Intangible Assets (Excluding Goodwill) (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Dec. 31, 2016
Schedule of Finite-lived and Indefinite-lived Intangible Assets [Line Items]          
Finite-Lived Intangible Assets, Gross [1],[2] $ 153,428   $ 153,428   $ 146,309
Finite-Lived Intangible Assets, Accumulated Amortization [1],[2] (92,046)   (92,046)   (88,499)
Intangible Assets, Gross (Excluding Goodwill) 189,152   189,152   181,942
Amortization expense 3,075 $ 3,116 6,061 $ 6,244  
Finite-Lived Intangible Assets, Amortization Expense, Remainder of Fiscal Year 11,700   11,700    
Finite-Lived Intangible Assets, Amortization Expense, Next Twelve Months 10,700   10,700    
Finite-Lived Intangible Assets, Amortization Expense, Year Two 10,600   10,600    
Finite-Lived Intangible Assets, Amortization Expense, Year Three 9,100   9,100    
Finite-Lived Intangible Assets, Amortization Expense, Year Four 3,000   3,000    
Trademarks and trade names          
Schedule of Finite-lived and Indefinite-lived Intangible Assets [Line Items]          
Indefinite-Lived Intangible Assets (Excluding Goodwill) 35,724   35,724   35,633
Unpatented technology          
Schedule of Finite-lived and Indefinite-lived Intangible Assets [Line Items]          
Finite-Lived Intangible Assets, Gross 8,392   8,392   8,186
Finite-Lived Intangible Assets, Accumulated Amortization (3,566)   (3,566)   (3,132)
Patents and other          
Schedule of Finite-lived and Indefinite-lived Intangible Assets [Line Items]          
Finite-Lived Intangible Assets, Gross 1,394   1,394   1,235
Finite-Lived Intangible Assets, Accumulated Amortization (444)   (444)   (695)
Trademarks and trade names          
Schedule of Finite-lived and Indefinite-lived Intangible Assets [Line Items]          
Finite-Lived Intangible Assets, Gross 5,317   5,317   4,918
Finite-Lived Intangible Assets, Accumulated Amortization (2,572)   (2,572)   (2,198)
Customer Relationships [Member]          
Schedule of Finite-lived and Indefinite-lived Intangible Assets [Line Items]          
Finite-Lived Intangible Assets, Gross 125,372   125,372   119,320
Finite-Lived Intangible Assets, Accumulated Amortization (84,454)   (84,454)   (81,614)
Land use rights          
Schedule of Finite-lived and Indefinite-lived Intangible Assets [Line Items]          
Finite-Lived Intangible Assets, Gross 12,953   12,953   12,650
Finite-Lived Intangible Assets, Accumulated Amortization $ (1,010)   $ (1,010)   $ (860)
Minimum [Member]          
Schedule of Finite-lived and Indefinite-lived Intangible Assets [Line Items]          
Finite-Lived Intangible Asset, Useful Life 1 year        
Maximum [Member]          
Schedule of Finite-lived and Indefinite-lived Intangible Assets [Line Items]          
Finite-Lived Intangible Asset, Useful Life 50 years        
[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.