Goodwill and Other Intangible Assets (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Changes in carrying amount of goodwill [Abstract]
Balance, beginning of period	$ 214,312
Change due to foreign currency	(43)
Balance, end of period	214,269
Other Intangible Assets [Abstract]
Gross carrying amount	93,485
Accumulated amortization	42,472
Estimated aggregate amortization expense [Abstract]
For the remaining 9 months of the year ending: 2013	10,529
For the year ending December 31: 2014	12,260
For the year ending December 31: 2015	9,746
For the year ending December 31: 2016	7,701
For the year ending December 31: 2017	5,519
For the year ending December 31: 2018	3,283
Thereafter	1,975
Total	51,013
Amortization included in cost of sales and operating expenses [Abstract]
Total amortization	3,581	3,745
Amortization included in cost of sales [Member]
Amortization included in cost of sales and operating expenses [Abstract]
Total amortization	1,522	1,755
Amortization included in operating expenses [Member]
Amortization included in cost of sales and operating expenses [Abstract]
Total amortization	2,059	1,990
Purchased Software [Member]
Other Intangible Assets [Abstract]
Weighted average remaining amortization period (years)	4 years 4 months 24 days
Gross carrying amount	31,046
Accumulated amortization	13,476
Purchased Software [Member] | Amortization included in cost of sales [Member]
Amortization included in cost of sales and operating expenses [Abstract]
Total amortization	1,126	1,150
Capitalized Software [Member]
Other Intangible Assets [Abstract]
Weighted average remaining amortization period (years)	1 year 8 months 12 days
Gross carrying amount	1,824
Accumulated amortization	1,571
Capitalized Software [Member] | Amortization included in cost of sales [Member]
Amortization included in cost of sales and operating expenses [Abstract]
Total amortization	37	53
Customer Relationships [Member]
Other Intangible Assets [Abstract]
Weighted average remaining amortization period (years)	5 years 10 months 24 days
Gross carrying amount	46,282
Accumulated amortization	16,916
Customer Relationships [Member] | Amortization included in operating expenses [Member]
Amortization included in cost of sales and operating expenses [Abstract]
Total amortization	1,904	1,813
Backlog [Member]
Other Intangible Assets [Abstract]
Weighted average remaining amortization period (years)	1 year 3 months 18 days
Gross carrying amount	9,680
Accumulated amortization	8,696
Backlog [Member] | Amortization included in cost of sales [Member]
Amortization included in cost of sales and operating expenses [Abstract]
Total amortization	359	552
Trade Names [Member]
Other Intangible Assets [Abstract]
Weighted average remaining amortization period (years)	7 years 6 months
Gross carrying amount	1,463
Accumulated amortization	486
Trade Names [Member] | Amortization included in operating expenses [Member]
Amortization included in cost of sales and operating expenses [Abstract]
Total amortization	40	62
Non-competes [Member]
Other Intangible Assets [Abstract]
Weighted average remaining amortization period (years)	4 years 1 month 6 days
Gross carrying amount	3,190
Accumulated amortization	1,327
Non-competes [Member] | Amortization included in operating expenses [Member]
Amortization included in cost of sales and operating expenses [Abstract]
Total amortization	115	115
Healthcare [Member]
Changes in carrying amount of goodwill [Abstract]
Balance, beginning of period	194,115
Change due to foreign currency	0
Balance, end of period	194,115
DNA [Member]
Changes in carrying amount of goodwill [Abstract]
Balance, beginning of period	20,197
Change due to foreign currency	(43)
Balance, end of period	$ 20,154