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CONSOLIDATED STATEMENTS OF INCOME (Parenthetical) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
CONSOLIDATED STATEMENTS OF INCOME        
Stock compensation expense $ 10,323 $ 9,176 $ 31,834 $ 27,573
Changes in fair value of contingent consideration $ (834) 313 $ (631) 510
Impairment of intangible assets   $ 0   $ 4,800