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Goodwill and Long-lived Assets (Details 1) (USD $)
 3 Months Ended 9 Months Ended 9 Months Ended 12 Months Ended 9 Months Ended 12 Months Ended 9 Months Ended 12 Months Ended 9 Months Ended 12 Months Ended 9 Months Ended 12 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Dec. 31, 2011
Sep. 30, 2012
Existing technology
Dec. 31, 2011
Existing technology
Sep. 30, 2012
Existing technology
Minimum
Dec. 31, 2011
Existing technology
Minimum
Sep. 30, 2012
Existing technology
Maximum
Dec. 31, 2011
Existing technology
Maximum
Sep. 30, 2012
Customer contracts and contractual relationships
Dec. 31, 2011
Customer contracts and contractual relationships
Sep. 30, 2012
Customer contracts and contractual relationships
Minimum
Dec. 31, 2011
Customer contracts and contractual relationships
Minimum
Sep. 30, 2012
Customer contracts and contractual relationships
Maximum
Dec. 31, 2011
Customer contracts and contractual relationships
Maximum
Sep. 30, 2012
Non-compete agreements
Dec. 31, 2011
Non-compete agreements
Sep. 30, 2012
Intellectual property
Dec. 31, 2011
Intellectual property
Sep. 30, 2012
Favorable contracts
Dec. 31, 2011
Favorable contracts
Components of intangible assets                                              
Useful Life (in years)               3 years 3 years 10 years 10 years     1 year 1 year 10 years 10 years 3 years 3 years 4 years 4 years    
Gross Carrying Amount $ 224,765,000   $ 224,765,000   $ 232,327,000 $ 181,431,000 [1] $ 187,993,000         $ 32,650,000 $ 33,550,000         $ 300,000 $ 400,000 $ 10,384,000 $ 10,384,000    
Accumulated Amortization (64,357,000)   (64,357,000)   (50,372,000) (40,766,000) [1] (32,682,000)         (13,074,000) (7,148,000)         (133,000) (158,000) (10,384,000) (10,384,000)    
Net Carrying Amount 160,408,000   160,408,000   181,955,000 140,665,000 [1] 155,311,000         19,576,000 26,402,000         167,000 242,000 0 0    
Amortization expense for intangible assets 8,000,000 6,900,000 23,535,000 12,908,000                                      
Acquired intangible assets                                           $ 5,200,000 $ 9,900,000
[1] The Company recorded a non-cash intangible impairment charge of $15.4 million related to the LDT group as discussed above which has been netted from the gross carrying amount and accumulated amortization for existing technology.