Goodwill and Other Intangible Assets (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended	12 Months Ended									3 Months Ended		12 Months Ended							12 Months Ended			3 Months Ended	12 Months Ended										3 Months Ended		12 Months Ended
	Dec. 31, 2012	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2012 Amortization included in cost of sales [Member]	Dec. 31, 2011 Amortization included in cost of sales [Member]	Dec. 31, 2010 Amortization included in cost of sales [Member]	Dec. 31, 2012 Amortization included in operating expenses [Member]	Dec. 31, 2011 Amortization included in operating expenses [Member]	Dec. 31, 2010 Amortization included in operating expenses [Member]	Dec. 31, 2012 Purchased Software [Member]	Jun. 30, 2011 Purchased Software [Member]	Dec. 31, 2012 Purchased Software [Member]	Dec. 31, 2011 Purchased Software [Member]	Dec. 31, 2012 Purchased Software [Member] Amortization included in cost of sales [Member]	Dec. 31, 2011 Purchased Software [Member] Amortization included in cost of sales [Member]	Dec. 31, 2010 Purchased Software [Member] Amortization included in cost of sales [Member]	Dec. 31, 2012 Capitalized Software [Member]	Dec. 31, 2011 Capitalized Software [Member]	Dec. 31, 2012 Capitalized Software [Member] Amortization included in cost of sales [Member]	Dec. 31, 2011 Capitalized Software [Member] Amortization included in cost of sales [Member]	Dec. 31, 2010 Capitalized Software [Member] Amortization included in cost of sales [Member]	Jun. 30, 2011 Customer Relationships [Member]	Dec. 31, 2012 Customer Relationships [Member]	Dec. 31, 2011 Customer Relationships [Member]	Dec. 31, 2012 Customer Relationships [Member] Amortization included in operating expenses [Member]	Dec. 31, 2011 Customer Relationships [Member] Amortization included in operating expenses [Member]	Dec. 31, 2010 Customer Relationships [Member] Amortization included in operating expenses [Member]	Dec. 31, 2012 Backlog [Member]	Dec. 31, 2011 Backlog [Member]	Dec. 31, 2012 Backlog [Member] Amortization included in cost of sales [Member]	Dec. 31, 2011 Backlog [Member] Amortization included in cost of sales [Member]	Dec. 31, 2010 Backlog [Member] Amortization included in cost of sales [Member]	Dec. 31, 2012 Trade Names [Member]	Jun. 30, 2011 Trade Names [Member]	Dec. 31, 2012 Trade Names [Member]	Dec. 31, 2011 Trade Names [Member]	Dec. 31, 2012 Trade Names [Member] Amortization included in operating expenses [Member]	Dec. 31, 2011 Trade Names [Member] Amortization included in operating expenses [Member]	Dec. 31, 2010 Trade Names [Member] Amortization included in operating expenses [Member]	Dec. 31, 2012 Non-competes [Member]	Dec. 31, 2011 Non-competes [Member]	Dec. 31, 2012 Non-competes [Member] Amortization included in operating expenses [Member]	Dec. 31, 2011 Non-competes [Member] Amortization included in operating expenses [Member]	Dec. 31, 2010 Non-competes [Member] Amortization included in operating expenses [Member]	Dec. 31, 2012 Healthcare [Member]	Dec. 31, 2010 Healthcare [Member]	Dec. 31, 2012 DNA [Member]	Dec. 31, 2010 DNA [Member]
Changes in carrying amount of goodwill [Abstract]
Balance, beginning of period		$ 209,829	$ 169,533	$ 169,533																																										$ 0	$ 0	$ 0	$ 0
Increase due to acquisitions		4,431		40,333																																										0	0	0	0
Increase due to foreign currency		52		(37)																																										0	0	52	0
Allocation in operating segments		0																																												194,115		20,145
Balance, end of period	214,312	214,312	209,829	169,533																																										194,115		20,197
Other Intangible Assets [Abstract]
Weighted-average remaining amortization period (years)													4 years 7 months 6 days					1 year 10 months 24 days						6 years 2 months 12 days					1 year 4 months 24 days							7 years 8 months 12 days					4 years 3 months 18 days
Gross carrying amount	93,526	93,526	93,266								31,066		31,066	31,382				1,825	1,825					46,302	45,068				9,680	9,680				1,463		1,463	2,081				3,190	3,230
Accumulated amortization	(38,891)	(38,891)	(24,190)								(12,350)		(12,350)	(7,955)				(1,534)	(1,328)					(15,012)	(7,576)				(8,338)	(6,127)				(446)		(446)	(413)				(1,211)	(791)
Gross intangible assets acquired													780	2,438										1,220	6,940					1,580						80	710					130
Impairment expense	3,872										796																							474	2,805
Amortization of intangible assets					7,917	8,849	9,928	8,627	9,404	3,793		5,635	1,110		5,501	4,915	7,100			205	189	583	3,476			7,434	5,667	3,183			2,211	3,745	2,245		3,157	620		732	3,241	315			461	496	295
Estimated aggregate amortization expense [Abstract]
2013	14,021	14,021
2014	12,367	12,367
2015	9,750	9,750
2016	7,706	7,706
2017	5,524	5,524
Thereafter	5,267	5,267
Total	54,635	54,635
Amortization included in cost of sales and operating expenses [Abstract]
Total amortization					7,917	8,849	9,928	8,627	9,404	3,793		5,635	1,110		5,501	4,915	7,100			205	189	583	3,476			7,434	5,667	3,183			2,211	3,745	2,245		3,157	620		732	3,241	315			461	496	295
Total amortization and impairment		$ 16,544	$ 18,253	$ 13,721