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Fair Value Measurements (Narrative) (Details) (USD $)
3 Months Ended 9 Months Ended
Sep. 30, 2012
interest_rate_swaps
Sep. 30, 2012
Fair Value, Option, Qualitative Disclosures Related to Election [Line Items]    
Fair value interest rate swap discount rate 1.60% 1.60%
Assets transferred between Level 1 and Level 2   $ 0
Number of interest rate swaps to convert fixed interest rate on notes to floating rate 2  
Revenue target period minimum (in years)   2 years
Revenue target period maximum (in years)   4 years
Percent change in projections affecting fair value of contigent consideration 5.00%  
Increase in fair value of contingent consideration due to 5% increase in projections 25,000,000  
Decrease in fair value of contigent considertion due to 5% decrease in projections 25,000,000  
Senior Debt Obligations Due 2014 [Member]
   
Fair Value, Option, Qualitative Disclosures Related to Election [Line Items]    
Fair value interest rate swap derivatives $ 250,000,000 $ 250,000,000
Debt instrument, maturity date   Dec. 31, 2014