Goodwill and Intangible Assets (Tables)

3 Months Ended

Mar. 31, 2013

Goodwill and Intangible Assets [Abstract]

Summary of other intangible assets

	March 31, 2013						December 31, 2012
	Cost		Accumulated Amortization		Net Book Value		Cost		Accumulated Amortization		Net Book Value
Customer contracts and relationships	$	17,381	$	12,944	$	4,437	$	17,381	$	12,463	$	4,918
Patents and technology		7,878		7,415		463		7,878		7,378		500
Trademarks and trade names		3,988		2,648		1,340		3,988		2,575		1,413
Other		3,301		3,142		159		3,301		3,128		173
	$	32,548	$	26,149	$	6,399	$	32,548	$	25,544	$	7,004

Summary of assigned lives and weighted average amortization periods by intangible asset category

Intangible Assets	Assigned Life		Weighted Average Amortization Period
Customer contracts and relationships		4 to 6 years		5.1
Patents and technology		1 to 6 years		5.2
Trademarks and trade names		3 to 8 years		7.4
Other		1 to 6 years		5.6

Schedule of expected amortization expense

Fiscal Year	Amount
2013	$	2,400
2014	$	1,967
2015	$	1,737
2016	$	468
2017	$	288
Thereafter	$	144