Goodwill and Other Intangible Assets Schedule of Other Intangible Assets (Details) (USD $) In Thousands, unless otherwise specified	6 Months Ended	12 Months Ended
	Jun. 30, 2013	Dec. 31, 2012
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	$ 175,791	$ 195,191
Accumulated amortization	(107,229)	(110,637)
Net carrying amount	68,562	84,554
Completed Technologies [Member]
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	62,331	71,531
Accumulated amortization	(30,666)	(32,842)
Net carrying amount	31,665	38,689
Weighted average amortization period (in years)	6 years	6 years
Customer Relationships [Member]
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	100,400	104,700
Accumulated amortization	(71,533)	(68,702)
Net carrying amount	28,867	35,998
Weighted average amortization period (in years)	9 years	9 years
Non-Compete Agreements [Member]
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	9,170	14,770
Accumulated amortization	(3,716)	(7,645)
Net carrying amount	5,454	7,125
Weighted average amortization period (in years)	4 years	5 years
Trademarks [Member]
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	3,400	3,700
Accumulated amortization	(824)	(958)
Net carrying amount	2,576	2,742
Weighted average amortization period (in years)	9 years	9 years
Acquired License Rights [Member]
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	490	490
Accumulated amortization	(490)	(490)
Net carrying amount	$ 0	$ 0
Weighted average amortization period (in years)	10 years	10 years