Goodwill and Other Intangible Assets (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Other Intangible Assets [Abstract]
Gross carrying amount	$ 95,803		$ 95,803
Accumulated amortization	59,066		59,066
Estimated aggregate amortization expense [Abstract]
For the remaining 6 months of the year ending: December 31, 2014	6,171		6,171
For the year ending December 31: 2015	10,123		10,123
For the year ending December 31: 2016	8,137		8,137
For the year ending December 31: 2017	5,988		5,988
For the year ending December 31: 2018	3,760		3,760
Thereafter	2,558		2,558
Total	36,737		36,737
Amortization included in cost of sales and operating expenses [Abstract]
Total amortization	3,389	3,584	6,661	7,165
Amortization included in cost of sales [Member]
Amortization included in cost of sales and operating expenses [Abstract]
Total amortization	1,400	1,527	2,759	3,049
Amortization included in operating expenses [Member]
Amortization included in cost of sales and operating expenses [Abstract]
Total amortization	1,989	2,057	3,902	4,116
Purchased Software [Member]
Other Intangible Assets [Abstract]
Weighted average remaining amortization period (years)			3 years
Gross carrying amount	32,497		32,497
Accumulated amortization	19,010		19,010
Purchased Software [Member] | Amortization included in cost of sales [Member]
Amortization included in cost of sales and operating expenses [Abstract]
Total amortization	1,258	1,131	2,516	2,257
Capitalized Software [Member]
Other Intangible Assets [Abstract]
Weighted average remaining amortization period (years)			4 years 2 months 12 days
Gross carrying amount	2,880		2,880
Accumulated amortization	1,812		1,812
Capitalized Software [Member] | Amortization included in cost of sales [Member]
Amortization included in cost of sales and operating expenses [Abstract]
Total amortization	84	38	127	75
Customer Relationships [Member]
Other Intangible Assets [Abstract]
Weighted average remaining amortization period (years)			4 years 10 months 24 days
Gross carrying amount	46,184		46,184
Accumulated amortization	26,150		26,150
Customer Relationships [Member] | Amortization included in operating expenses [Member]
Amortization included in cost of sales and operating expenses [Abstract]
Total amortization	1,802	1,902	3,560	3,806
Backlog [Member]
Other Intangible Assets [Abstract]
Weighted average remaining amortization period (years)			0 years 6 months
Gross carrying amount	9,680		9,680
Accumulated amortization	9,564		9,564
Backlog [Member] | Amortization included in cost of sales [Member]
Amortization included in cost of sales and operating expenses [Abstract]
Total amortization	58	358	116	717
Trade Names [Member]
Other Intangible Assets [Abstract]
Weighted average remaining amortization period (years)			6 years 7 months 6 days
Gross carrying amount	1,463		1,463
Accumulated amortization	685		685
Trade Names [Member] | Amortization included in operating expenses [Member]
Amortization included in cost of sales and operating expenses [Abstract]
Total amortization	40	40	80	80
Non-competes [Member]
Other Intangible Assets [Abstract]
Weighted average remaining amortization period (years)			2 years 9 months 18 days
Gross carrying amount	3,099		3,099
Accumulated amortization	1,845		1,845
Non-competes [Member] | Amortization included in operating expenses [Member]
Amortization included in cost of sales and operating expenses [Abstract]
Total amortization	$ 147	$ 115	$ 262	$ 230