Goodwill and Other Intangible Assets (Narrative) (Details) (USD $)
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12 Months Ended | 12 Months Ended | 12 Months Ended | 12 Months Ended | |||||||
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Dec. 31, 2012
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Dec. 31, 2011
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Dec. 31, 2010
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Dec. 31, 2012
Verivue [Member]
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Dec. 04, 2012
Verivue [Member]
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Dec. 31, 2012
FastSoft [Member]
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Sep. 13, 2012
FastSoft [Member]
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Dec. 31, 2012
Cotendo [Member]
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Mar. 06, 2012
Cotendo [Member]
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Dec. 31, 2012
Blaze [Member]
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Feb. 07, 2012
Blaze [Member]
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Business Acquisition [Line Items] | |||||||||||
Purchase price allocation associated with acquisition | $ 20,690,000 | $ 8,825,000 | $ 233,828,000 | $ 15,068,000 | |||||||
Identifiable intangible assets | 7,500,000 | 3,700,000 | 43,800,000 | 5,100,000 | |||||||
Amortization of other intangible assets | 20,962,000 | 17,070,000 | 16,657,000 | ||||||||
Future amortization expense, 2013 | 24,300,000 | ||||||||||
Future amortization expense, 2014 | 19,300,000 | ||||||||||
Future amortization expense, 2015 | 16,600,000 | ||||||||||
Future amortization expense, 2016 | 11,700,000 | ||||||||||
Future amortization expense, 2017 | $ 7,600,000 |