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Goodwill and Intangible Assets Intangible Assests (Excluding Goodwill) (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Dec. 31, 2014
Schedule of Finite-lived and Indefinite-lived Intangible Assets [Line Items]          
Finite-Lived Intangible Assets, Gross [1],[2] $ 220,022   $ 220,022   $ 210,677
Finite-Lived Intangible Assets, Accumulated Amortization [1],[2] (111,208)   (111,208)   (104,673)
Amortization expense 4,123 $ 4,475 8,527 $ 8,964  
Finite-Lived Intangible Assets, Amortization Expense, Next Twelve Months 16,500   16,500    
Finite-Lived Intangible Assets, Amortization Expense, Year Two 14,400   14,400    
Finite-Lived Intangible Assets, Amortization Expense, Year Three 13,400   13,400    
Finite-Lived Intangible Assets, Amortization Expense, Year Four 12,700   12,700    
Finite-Lived Intangible Assets, Amortization Expense, Year Five 12,600   12,600    
Trademarks and trade names          
Schedule of Finite-lived and Indefinite-lived Intangible Assets [Line Items]          
Indefinite-Lived Intangible Assets (Excluding Goodwill) 47,535   47,535   47,662
Unpatented technology          
Schedule of Finite-lived and Indefinite-lived Intangible Assets [Line Items]          
Finite-Lived Intangible Assets, Gross 34,018   34,018   35,933
Finite-Lived Intangible Assets, Accumulated Amortization (6,168)   (6,168)   (6,979)
Patents          
Schedule of Finite-lived and Indefinite-lived Intangible Assets [Line Items]          
Finite-Lived Intangible Assets, Gross 7,779   7,779   7,809
Finite-Lived Intangible Assets, Accumulated Amortization (6,536)   (6,536)   (6,213)
Trademarks and trade names          
Schedule of Finite-lived and Indefinite-lived Intangible Assets [Line Items]          
Finite-Lived Intangible Assets, Gross 8,976   8,976   8,981
Finite-Lived Intangible Assets, Accumulated Amortization (6,663)   (6,663)   (6,206)
Non-compete agreements          
Schedule of Finite-lived and Indefinite-lived Intangible Assets [Line Items]          
Finite-Lived Intangible Assets, Gross 421   421   421
Finite-Lived Intangible Assets, Accumulated Amortization (263)   (263)   (88)
Customer relations          
Schedule of Finite-lived and Indefinite-lived Intangible Assets [Line Items]          
Finite-Lived Intangible Assets, Gross 154,544   154,544   154,945
Finite-Lived Intangible Assets, Accumulated Amortization (91,121)   (91,121)   (84,776)
Use Rights [Member]          
Schedule of Finite-lived and Indefinite-lived Intangible Assets [Line Items]          
Finite-Lived Intangible Assets, Gross 14,284   14,284   2,588
Finite-Lived Intangible Assets, Accumulated Amortization $ (457)   $ (457)   $ (411)
[1] Amounts include the impact of foreign currency translation. Fully amortized amounts are written off.
[2] The Company amortizes certain identifiable intangible assets mainly on a straight-line basis over their estimated useful lives, which range from one to 50 years.