The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method.

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Goodwill and Other Intangible Assets (Details 2) (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
Intangible Assets, by category
Gross Carrying Amount	$ 243,258		$ 243,258		$ 250,338
Accumulated Amortization	175,987		175,987		172,612
Amortization expense for intangible assets	3,904	4,099	7,852	9,407
Estimated amortization expense for next 5 years
2013	16,500		16,500
2014	14,250		14,250
2015	9,750		9,750
2016	8,000		8,000
2017	4,250		4,250
Customer related
Intangible Assets, by category
Gross Carrying Amount	178,395		178,395		183,862
Accumulated Amortization	131,259		131,259		129,904
Non-compete agreements
Intangible Assets, by category
Gross Carrying Amount	1,328		1,328		1,347
Accumulated Amortization	1,299		1,299		1,310
Patents
Intangible Assets, by category
Gross Carrying Amount	6,782		6,782		6,909
Accumulated Amortization	5,551		5,551		5,503
Technology related
Intangible Assets, by category
Gross Carrying Amount	29,182		29,182		29,588
Accumulated Amortization	18,796		18,796		17,551
Trade names
Intangible Assets, by category
Gross Carrying Amount	18,072		18,072		18,685
Accumulated Amortization	12,841		12,841		11,688
Other
Intangible Assets, by category
Gross Carrying Amount	9,499		9,499		9,947
Accumulated Amortization	$ 6,241		$ 6,241		$ 6,656