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Intangible Asset and Goodwill (Details 3) (USD $)
 3 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended 6 Months Ended 12 Months Ended 6 Months Ended 12 Months Ended 6 Months Ended 12 Months Ended 6 Months Ended 12 Months Ended 6 Months Ended 12 Months Ended 3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Dec. 31, 2012
Jun. 30, 2013
Existing technology
Jun. 30, 2013
Existing technology
Dec. 31, 2012
Existing technology
Jun. 30, 2013
Existing technology
Minimum
Dec. 31, 2012
Existing technology
Minimum
Jun. 30, 2013
Existing technology
Maximum
Dec. 31, 2012
Existing technology
Maximum
Jun. 30, 2013
Customer contracts and contractual relationships
Dec. 31, 2012
Customer contracts and contractual relationships
Jun. 30, 2013
Customer contracts and contractual relationships
Minimum
Dec. 31, 2012
Customer contracts and contractual relationships
Minimum
Jun. 30, 2013
Customer contracts and contractual relationships
Maximum
Dec. 31, 2012
Customer contracts and contractual relationships
Maximum
Jun. 30, 2013
Non-compete agreements
Dec. 31, 2012
Non-compete agreements
Jun. 30, 2012
Favorable contracts
Jun. 30, 2013
Favorable contracts
Jun. 30, 2012
Favorable contracts
Dec. 31, 2012
Favorable contracts
Jun. 30, 2012
Various Acquisitions
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          
Gross Carrying Amount $ 226,295,000   $ 226,295,000   $ 224,765,000 $ 193,345,000 $ 193,345,000 $ 191,815,000         $ 32,650,000 $ 32,650,000         $ 300,000 $ 300,000          
Accumulated Amortization (86,900,000)   (86,900,000)   (71,592,000) (69,728,000) (69,728,000) (57,240,000)         (16,964,000) (14,194,000)         (208,000) (158,000)          
Net Carrying Amount 139,395,000   139,395,000   153,173,000 123,617,000 123,617,000 134,575,000         15,686,000 18,456,000         92,000 142,000          
Intangible asset purchased           600,000 2,500,000                                    
Proceeds from sale of intellectual property     2,250,000 0   250,000 2,250,000                                    
Business combinations and asset acquisitions, Purchase Price                                                 48,200,000
Cash received related to favorable contracts                                         1,200,000 1,400,000 3,600,000    
Acquired intangible assets                                           3,400,000   4,800,000  
Amortization expense for intangible assets $ 7,000,000 $ 7,900,000 $ 14,037,000 $ 15,559,000