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Goodwill and Intangible Assets Intangible Assests (Excluding Goodwill) (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Dec. 31, 2013
Schedule of Finite-lived and Indefinite-lived Intangible Assets [Line Items]          
Finite-Lived Intangible Assets, Gross $ 212,695   $ 212,695   $ 219,424
Finite-Lived Intangible Assets, Accumulated Amortization (96,121)   (96,121)   (95,158)
Amortization expense 4,475 4,922 8,964 9,817  
Finite-Lived Intangible Assets, Amortization Expense, Next Twelve Months 17,900   17,900    
Finite-Lived Intangible Assets, Amortization Expense, Year Two 16,300   16,300    
Finite-Lived Intangible Assets, Amortization Expense, Year Three 14,400   14,400    
Finite-Lived Intangible Assets, Amortization Expense, Year Four 13,500   13,500    
Finite-Lived Intangible Assets, Amortization Expense, Year Five 12,800   12,800    
Trademarks and trade names
          
Schedule of Finite-lived and Indefinite-lived Intangible Assets [Line Items]          
Indefinite-Lived Intangible Assets (Excluding Goodwill) 47,869   47,869   47,876
Unpatented technology
          
Schedule of Finite-lived and Indefinite-lived Intangible Assets [Line Items]          
Finite-Lived Intangible Assets, Gross 36,296   36,296   43,133
Finite-Lived Intangible Assets, Accumulated Amortization (6,040)   (6,040)   (11,776)
Patents
          
Schedule of Finite-lived and Indefinite-lived Intangible Assets [Line Items]          
Finite-Lived Intangible Assets, Gross 7,866   7,866   7,904
Finite-Lived Intangible Assets, Accumulated Amortization (5,868)   (5,868)   (5,397)
Trademarks and trade names
          
Schedule of Finite-lived and Indefinite-lived Intangible Assets [Line Items]          
Finite-Lived Intangible Assets, Gross 9,104   9,104   9,244
Finite-Lived Intangible Assets, Accumulated Amortization (5,369)   (5,369)   (4,525)
Non-compete agreements
          
Schedule of Finite-lived and Indefinite-lived Intangible Assets [Line Items]          
Finite-Lived Intangible Assets, Gross 415   415   0
Finite-Lived Intangible Assets, Accumulated Amortization (3)   (3)   0
Customer relations
          
Schedule of Finite-lived and Indefinite-lived Intangible Assets [Line Items]          
Finite-Lived Intangible Assets, Gross 159,014   159,014   159,143
Finite-Lived Intangible Assets, Accumulated Amortization $ (78,841)   $ (78,841)   $ (73,460)