Goodwill and Other Intangible Assets (Details 2) (USD $)	12 Months Ended
	Dec. 31, 2012		Dec. 31, 2011	Dec. 31, 2010
Finite-Lived Intangible Assets [Line Items]
Intangible assets, net	$ 77,726,000		$ 93,501,000
Gross Carrying Amount	250,338,000		250,597,000
Accumulated Amortization	172,612,000		157,096,000
Amortization expense for intangible assets	17,600,000		31,500,000	33,000,000
Estimated amortization expense for the next five years
2013	16,500,000	[1]
2014	14,250,000	[1]
2015	9,750,000	[1]
2016	8,000,000	[1]
2017	4,250,000	[1]
Customer related
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	183,862,000		183,576,000
Accumulated Amortization	129,904,000		119,708,000
Non-compete agreements
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	1,347,000		1,353,000
Accumulated Amortization	1,310,000		1,301,000
Patents
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	6,909,000		6,884,000
Accumulated Amortization	5,503,000		5,145,000
Technology related
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	29,588,000		29,497,000
Accumulated Amortization	17,551,000		14,614,000
Trade names
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	18,685,000		18,538,000
Accumulated Amortization	11,688,000		8,379,000
Other
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	9,947,000		10,749,000
Accumulated Amortization	$ 6,656,000		$ 7,949,000

[1] These estimated amortization expense amounts do not reflect the potential effect of future foreign currency exchange rate fluctuations.