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Business Acquisitions (Details) (USD $)
9 Months Ended 0 Months Ended 3 Months Ended 9 Months Ended 9 Months Ended 3 Months Ended 9 Months Ended 0 Months Ended
Sep. 30, 2012
FastSoft, Blaze and Cotendo [Member]
Sep. 13, 2012
FastSoft [Member]
Y
Sep. 30, 2012
FastSoft [Member]
Sep. 30, 2012
Cotendo Acquisition [Member]
Y
Sep. 30, 2012
Cotendo Acquisition [Member]
Mar. 31, 2012
Cotendo Acquisition [Member]
Mar. 06, 2012
Cotendo Acquisition [Member]
Sep. 30, 2012
Cotendo Acquisition [Member]
Completed Technology [Member]
Y
Sep. 30, 2012
Cotendo Acquisition [Member]
Customer Relationships [Member]
Y
Sep. 30, 2012
Cotendo Acquisition [Member]
Non-Compete Agreements [Member]
Y
Sep. 30, 2012
Cotendo Acquisition [Member]
Trademarks and Trade Names [Member]
Y
Sep. 30, 2012
Cotendo Acquisition [Member]
Trademarks and Trade Names [Member]
Y
Feb. 07, 2012
Blaze Acquisition [Member]
Y
Mar. 31, 2012
Blaze Acquisition [Member]
Business Acquisition [Line Items]                            
Acquisition related costs $ 5,100,000                          
Total purchase consideration   14,400,000         278,877,000           19,300,000  
Business acquisition purchase price allocation for goodwill   12,200,000 12,233,000     241,646,000 241,386,000           15,100,000 15,068,000
Identifiable intangible assets   3,700,000         43,800,000           5,100,000  
Weighted average amortization period (in years)   9.0   7.1       6 9 6 10 10 5.3  
Goodwill, expected tax deductible amount   2,900,000   55,800,000 55,800,000               13,500,000  
Current assets, including cash and cash equivalents of $6,405             6,751,000              
Trade receivables             2,920,000              
Property and equipment             5,812,000              
Indemnification assets             6,200,000              
Long-term assets             75,000              
Deferred tax liabilities             (22,934,000)              
Other liabilities assumed             (5,133,000)              
Gross carrying amount, intangible assets       $ 43,800,000 $ 43,800,000     $ 24,100,000 $ 13,400,000 $ 3,900,000 $ 2,400,000 $ 2,400,000    
Weighted average cost of capital         15.00%                  
Royalty rate for intangible assets               .15       .01    
Discount rate         .16                  
Tax rate for Intangible Assets         .385