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Acquisitions Acquisition Related Costs (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Business Acquisition [Line Items]        
Transaction costs $ 0 $ 0 $ 26,799 $ 0
Integration costs 6,075 0 9,053 0
Changes in fair value of contingent consideration 29,684 8,303 45,707 10,254
Acquisition related costs $ 35,759 $ 8,303 $ 81,559 $ 10,254