Goodwill and Intangible Assets Intangible Assests (Excluding Goodwill) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012	Dec. 31, 2012
Schedule of Finite-lived and Indefinite-lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Gross	$ 218,838		$ 218,838		$ 222,031
Finite-Lived Intangible Assets, Accumulated Amortization	(85,767)		(85,767)		(80,330)
Indefinite-Lived Intangible Assets (Excluding Goodwill)	48,093		48,093		47,762
Amortization expense	4,922	3,250	9,817	6,320
Finite-Lived Intangible Assets, Amortization Expense, Next Twelve Months	19,200		19,200
Finite-Lived Intangible Assets, Amortization Expense, Year Two	17,800		17,800
Finite-Lived Intangible Assets, Amortization Expense, Year Three	16,200		16,200
Finite-Lived Intangible Assets, Amortization Expense, Year Four	14,300		14,300
Finite-Lived Intangible Assets, Amortization Expense, Year Five	13,300		13,300
Unpatented Technology [Member]
Schedule of Finite-lived and Indefinite-lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Gross	42,944		42,944		45,078
Finite-Lived Intangible Assets, Accumulated Amortization	(10,406)		(10,406)		(11,286)
Patents [Member]
Schedule of Finite-lived and Indefinite-lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Gross	7,908		7,908		9,880
Finite-Lived Intangible Assets, Accumulated Amortization	(5,067)		(5,067)		(6,664)
Product Names [Member]
Schedule of Finite-lived and Indefinite-lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Gross	9,053		9,053		9,068
Finite-Lived Intangible Assets, Accumulated Amortization	(3,632)		(3,632)		(2,712)
Customer Relationships [Member]
Schedule of Finite-lived and Indefinite-lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Gross	158,933		158,933		158,005
Finite-Lived Intangible Assets, Accumulated Amortization	(66,662)		(66,662)		(59,668)
Trademarks and trade names [Member]
Schedule of Finite-lived and Indefinite-lived Intangible Assets [Line Items]
Indefinite-Lived Intangible Assets (Excluding Goodwill)	$ 48,093		$ 48,093		$ 47,762