Goodwill and Other Intangible Assets (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 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		214,269
Other Intangible Assets [Abstract]
Gross carrying amount	93,485		93,485
Accumulated amortization	49,606		49,606
Estimated aggregate amortization expense [Abstract]
For the remaining 9 months of the year ending: 2013	3,395		3,395
For the year ending December 31: 2014	12,260		12,260
For the year ending December 31: 2015	9,746		9,746
For the year ending December 31: 2016	7,701		7,701
For the year ending December 31: 2017	5,519		5,519
For the year ending December 31: 2018	3,283		3,283
Thereafter	1,975		1,975
Total	43,879		43,879
Amortization included in cost of sales and operating expenses [Abstract]
Total amortization	3,550	3,847	10,715	11,434
Amortization included in cost of sales [Member]
Amortization included in cost of sales and operating expenses [Abstract]
Total amortization	1,425	1,792	4,474	5,335
Amortization included in operating expenses [Member]
Amortization included in cost of sales and operating expenses [Abstract]
Total amortization	2,125	2,055	6,241	6,099
Purchased Software [Member]
Other Intangible Assets [Abstract]
Weighted average remaining amortization period (years)			3 years 10 months 24 days
Gross carrying amount	31,046		31,046
Accumulated amortization	15,737		15,737
Purchased Software [Member] | Amortization included in cost of sales [Member]
Amortization included in cost of sales and operating expenses [Abstract]
Total amortization	1,131	1,185	3,388	3,519
Capitalized Software [Member]
Other Intangible Assets [Abstract]
Weighted average remaining amortization period (years)			1 year 2 months 12 days
Gross carrying amount	1,824		1,824
Accumulated amortization	1,647		1,647
Capitalized Software [Member] | Amortization included in cost of sales [Member]
Amortization included in cost of sales and operating expenses [Abstract]
Total amortization	38	54	113	157
Customer Relationships [Member]
Other Intangible Assets [Abstract]
Weighted average remaining amortization period (years)			5 years 6 months
Gross carrying amount	46,282		46,282
Accumulated amortization	20,790		20,790
Customer Relationships [Member] | Amortization included in operating expenses [Member]
Amortization included in cost of sales and operating expenses [Abstract]
Total amortization	1,971	1,873	5,777	5,560
Backlog [Member]
Other Intangible Assets [Abstract]
Weighted average remaining amortization period (years)			1 year 3 months 18 days
Gross carrying amount	9,680		9,680
Accumulated amortization	9,310		9,310
Backlog [Member] | Amortization included in cost of sales [Member]
Amortization included in cost of sales and operating expenses [Abstract]
Total amortization	256	553	973	1,659
Trade Names [Member]
Other Intangible Assets [Abstract]
Weighted average remaining amortization period (years)			7 years 1 month 6 days
Gross carrying amount	1,463		1,463
Accumulated amortization	565		565
Trade Names [Member] | Amortization included in operating expenses [Member]
Amortization included in cost of sales and operating expenses [Abstract]
Total amortization	39	66	119	193
Non-competes [Member]
Other Intangible Assets [Abstract]
Weighted average remaining amortization period (years)			3 years 7 months 6 days
Gross carrying amount	3,190		3,190
Accumulated amortization	1,557		1,557
Non-competes [Member] | Amortization included in operating expenses [Member]
Amortization included in cost of sales and operating expenses [Abstract]
Total amortization	115	116	345	346
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		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		$ 20,154