Goodwill and Intangible Assets Intangible Assests (Excluding Goodwill) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013	Dec. 31, 2013
Schedule of Finite-lived and Indefinite-lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Gross	$ 211,049		$ 211,049		$ 219,424
Finite-Lived Intangible Assets, Accumulated Amortization	(100,392)		(100,392)		(95,158)
Amortization expense	4,501	4,825	13,465	14,642
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)	47,728		47,728		47,876
Unpatented technology
Schedule of Finite-lived and Indefinite-lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Gross	36,048		36,048		43,133
Finite-Lived Intangible Assets, Accumulated Amortization	(6,512)		(6,512)		(11,776)
Patents
Schedule of Finite-lived and Indefinite-lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Gross	7,829		7,829		7,904
Finite-Lived Intangible Assets, Accumulated Amortization	(6,036)		(6,036)		(5,397)
Trademarks and trade names
Schedule of Finite-lived and Indefinite-lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Gross	9,048		9,048		9,244
Finite-Lived Intangible Assets, Accumulated Amortization	(5,801)		(5,801)		(4,525)
Non-compete agreements
Schedule of Finite-lived and Indefinite-lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Gross	420		420		0
Finite-Lived Intangible Assets, Accumulated Amortization	(28)		(28)		0
Customer relations
Schedule of Finite-lived and Indefinite-lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Gross	157,704		157,704		159,143
Finite-Lived Intangible Assets, Accumulated Amortization	$ (82,015)		$ (82,015)		$ (73,460)