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Pending Acquisition (Details) - USD ($)
shares in Thousands, $ in Thousands
Feb. 10, 2015
May. 30, 2015
Apr. 02, 2015
6.125% senior notes due 2023      
Pending Acquisition      
Debt instrument, stated interest rate (as a percent)   6.125%  
T P G EnvisionRx | 6.125% senior notes due 2023      
Pending Acquisition      
Principal amount of debt     $ 1,800,000
Debt instrument, stated interest rate (as a percent)     6.125%
T P G EnvisionRx | Forecast      
Pending Acquisition      
Cash payment $ 1,800,000    
Number of shares of common stock issued 27,862