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Amortizable Intangible Assets (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 3 Months Ended 12 Months Ended 3 Months Ended 12 Months Ended 3 Months Ended 12 Months Ended 3 Months Ended 12 Months Ended 3 Months Ended 12 Months Ended
Mar. 31, 2012
Mar. 31, 2011
Dec. 31, 2011
Mar. 31, 2012
Patents
Y
Dec. 31, 2011
Patents
Y
Mar. 31, 2012
Customer contracts and contractual relationships
Y
Dec. 31, 2011
Customer contracts and contractual relationships
Y
Mar. 31, 2012
Existing technology
Y
Dec. 31, 2011
Existing technology
Y
Mar. 31, 2012
Non-compete agreements
Y
Dec. 31, 2011
Non-compete agreements
Y
Mar. 31, 2012
Intellectual property
Y
Dec. 31, 2011
Intellectual property
Y
Components of intangible assets                          
Minimum useful life (in years)       3 3 1 1 3 3        
Maximum useful life (in years)       10 10 10 10 10 7        
Useful life (in years)                   3 3 4 4
Gross Carrying Amount $ 251,597   $ 232,327 $ 29,943 $ 28,643 $ 32,650 $ 33,550 $ 178,320 $ 159,350 $ 300 $ 400 $ 10,384 $ 10,384
Accumulated Amortization (56,702)   (50,372) (13,965) (12,997) (9,357) (7,148) (22,913) (19,685) (83) (158) (10,384) (10,384)
Net Carrying Amount 194,895   181,955 15,978 15,646 23,293 26,402 155,407 139,665 217 242    
Amortization expense for intangible assets $ 7,616 $ 1,979