Goodwill and Intangible Assets Schedule of Finite and Indefinite-Lived Intangible Assets (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Schedule of Finite and Indefinite-Lived Intangible Assets [Line Items]
Finite lived intangible assets, gross	$ 211,754,000	$ 221,915,000
Accumulated amortization	(185,044,000)	(180,311,000)
Finite lived intangible assets, net	26,315,000	40,631,000
Finite lived intangible assets including customer relationships, net	26,710,000	41,604,000
Intangible assets, gross (excluding goodwill)	217,854,000	228,015,000
Indefinite and finite lived intangible assets accumulated amortization	185,044,000	180,311,000
Intangible assets including customer relationships, net (excluding goodwill)	32,810,000	47,704,000
Intangible asset amortization expense, [Abstract]
Amortization of intangible assets	13,500,000	15,200,000	16,100,000
2015	11,919,000
2016	10,597,000
2017	4,446,000
2018	497,000
2019	192,000
Trade Names
Schedule of Finite and Indefinite-Lived Intangible Assets [Line Items]
Indefinite lived intangible assets, gross	6,100,000	6,100,000
Indefinite lived intangible assets accumulate amortization	0	0
Indefinite lived intangible assets, net	6,100,000	6,100,000
Customer Relationships
Schedule of Finite and Indefinite-Lived Intangible Assets [Line Items]
Finite lived intangible assets, gross	205,760,000	215,922,000
Accumulated amortization	(179,445,000)	(175,291,000)
Finite lived intangible assets, net	26,315,000	40,631,000
Intangible asset amortization expense, [Abstract]
Finite-lived intangible asset, useful life	12 years
Patents
Schedule of Finite and Indefinite-Lived Intangible Assets [Line Items]
Finite lived intangible assets, gross	5,994,000	5,993,000
Accumulated amortization	(5,599,000)	(5,020,000)
Finite lived intangible assets, net	$ 395,000	$ 973,000
Intangible asset amortization expense, [Abstract]
Finite-lived intangible asset, useful life	10 years