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Intangible and Other Assets (Details 1) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2011
Jul. 31, 2011
Dec. 31, 2010
Finite Lived Intangible Assets And Deferred Debt Issuance Costs [Line Items]      
Intangible assets and deferred debt issuance costs $ 320,357   $ 315,177
Intangible assets and deferred debt issuance costs, accumulated amortization (157,792)   (128,824)
Transaction costs related to credit facility 44,141 7,800 39,367
Amortization of deferred debt issuance costs (19,560)   (14,632)
Marketing related [Member]
      
Finite Lived Intangible Assets And Deferred Debt Issuance Costs [Line Items]      
Gross Carrying Amount 3,043   2,727
Accumulated Amortization (1,400)   (1,211)
Customer related [Member]
      
Finite Lived Intangible Assets And Deferred Debt Issuance Costs [Line Items]      
Gross Carrying Amount 175,676   175,798
Accumulated Amortization (76,943)   (60,511)
Technology based [Member]
      
Finite Lived Intangible Assets And Deferred Debt Issuance Costs [Line Items]      
Gross Carrying Amount 32,275   32,361
Accumulated Amortization (6,747)   (5,035)
Contract based [Member]
      
Finite Lived Intangible Assets And Deferred Debt Issuance Costs [Line Items]      
Gross Carrying Amount 65,222   64,924
Accumulated Amortization $ (53,142)   $ (47,435)