Goodwill and Intangibles (Tables)

3 Months Ended

12 Months Ended

Mar. 31, 2013

Dec. 31, 2012

Carrying amount of goodwill by reportable operating segment

The changes in the carrying amount of goodwill by reportable operating segment for the three months ended March 31, 2013 are summarized as follows:

	North America			Europe			South America		Asia Pacific		Total
Balance at January 1, 2013	$	115,420		$	13,836		$	—	$	4,460	$	133,716
Foreign exchange translation		(101	)		(384	)				11		(474	)
Balance at March 31, 2013	$	115,319		$	13,452		$	—	$	4,471	$	133,242

The changes in the carrying amount of goodwill by reportable operating segment for the years ended December 31, 2011 and 2012 are summarized as follows:

	North America			Europe			South America			Asia Pacific		Total
Balance at December 31, 2010	$	115,384		$	13,926		$	3,480		$	4,210	$	137,000
Foreign exchange translation		(86	)		(330	)		(378	)		200		(594	)
Balance at December 31, 2011	$	115,298		$	13,596		$	3,102		$	4,410	$	136,406
Foreign exchange translation		122			240			(315	)		50		97
Impairment charges		—			—			(2,787	)		—		(2,787	)
Balance at December 31, 2012	$	115,420		$	13,836		$	—		$	4,460	$	133,716

Intangible Assets and Accumulated Amortization Balances

The following table presents intangible assets and accumulated amortization balances of the Company as of December 31, 2012 and March 31, 2013, respectively:

	Gross Carrying Amount		Accumulated Amortization			Net Carrying Amount		Weighted Average Useful Life (Years)
Customer relationships	$	135,741	$	(34,184	)	$	101,557		7.7
Developed technology		9,574		(4,143	)		5,431		3.9
Other		10,337		(601	)		9,736
Balance at December 31, 2012	$	155,652	$	(38,928	)	$	116,724		7.1
Customer relationships	$	136,115	$	(37,637	)	$	98,478		7.4
Developed technology		9,461		(4,491	)		4,970		3.7
Other		10,434		(731	)		9,703
Balance at March 31, 2013	$	156,010	$	(42,859	)	$	113,151		6.9

The following table presents intangible assets and accumulated amortization balances of the Company as of December 31, 2011 and 2012, respectively:

	Gross Carrying Amount		Accumulated Amortization			Net Carrying Amount		Weighted Average Useful Life (Years)
Customer relationships	$	138,576	$	(21,267	)	$	117,309		8.6
Developed technology		9,503		(2,521	)		6,982		4.8
Other		7,603		(203	)		7,400
Balance at December 31, 2011	$	155,682	$	(23,991	)	$	131,691		8.1
Customer relationships	$	135,741	$	(34,184	)	$	101,557		7.7
Developed technology		9,574		(4,143	)		5,431		3.9
Other		10,337		(601	)		9,736
Balance at December 31, 2012	$	155,652	$	(38,928	)	$	116,724		7.1

Estimated amortization expense

Estimated amortization expense for the next five years is shown in the table below:

Year	Expense
2013	$	15,446
2014		15,257
2015		15,131
2016		14,739
2017		14,021