Goodwill and Other Intangible Assets (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Other Intangible Assets [Abstract]
Gross carrying amount	$ 95,529
Accumulated amortization	56,078
Estimated aggregate amortization expense [Abstract]
For the remaining 9 months of the year ending: December 31, 2014	9,342
For the year ending December 31: 2015	10,063
For the year ending December 31: 2016	8,043
For the year ending December 31: 2017	5,861
For the year ending December 31: 2018	3,625
Thereafter	2,517
Total	39,451
Amortization included in cost of sales and operating expenses [Abstract]
Total amortization	3,272	3,581
Amortization included in cost of sales [Member]
Amortization included in cost of sales and operating expenses [Abstract]
Total amortization	1,359	1,522
Amortization included in operating expenses [Member]
Amortization included in cost of sales and operating expenses [Abstract]
Total amortization	1,913	2,059
Purchased Software [Member]
Other Intangible Assets [Abstract]
Weighted average remaining amortization period (years)	3 years 2 months 12 days
Gross carrying amount	32,357
Accumulated amortization	17,912
Purchased Software [Member] | Amortization included in cost of sales [Member]
Amortization included in cost of sales and operating expenses [Abstract]
Total amortization	1,258	1,126
Capitalized Software [Member]
Other Intangible Assets [Abstract]
Weighted average remaining amortization period (years)	4 years 4 months 24 days
Gross carrying amount	2,506
Accumulated amortization	1,729
Capitalized Software [Member] | Amortization included in cost of sales [Member]
Amortization included in cost of sales and operating expenses [Abstract]
Total amortization	43	37
Customer Relationships [Member]
Other Intangible Assets [Abstract]
Weighted average remaining amortization period (years)	5 years 1 month 6 days
Gross carrying amount	46,333
Accumulated amortization	24,498
Customer Relationships [Member] | Amortization included in operating expenses [Member]
Amortization included in cost of sales and operating expenses [Abstract]
Total amortization	1,758	1,904
Backlog [Member]
Other Intangible Assets [Abstract]
Weighted average remaining amortization period (years)	0 years 9 months 18 days
Gross carrying amount	9,680
Accumulated amortization	9,506
Backlog [Member] | Amortization included in cost of sales [Member]
Amortization included in cost of sales and operating expenses [Abstract]
Total amortization	58	359
Trade Names [Member]
Other Intangible Assets [Abstract]
Weighted average remaining amortization period (years)	6 years 9 months 18 days
Gross carrying amount	1,463
Accumulated amortization	645
Trade Names [Member] | Amortization included in operating expenses [Member]
Amortization included in cost of sales and operating expenses [Abstract]
Total amortization	40	40
Non-competes [Member]
Other Intangible Assets [Abstract]
Weighted average remaining amortization period (years)	3 years 1 month 6 days
Gross carrying amount	3,190
Accumulated amortization	1,788
Non-competes [Member] | Amortization included in operating expenses [Member]
Amortization included in cost of sales and operating expenses [Abstract]
Total amortization	$ 115	$ 115