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Goodwill (Details) - USD ($)
$ in Thousands
6 Months Ended 12 Months Ended
Jun. 30, 2019
Dec. 31, 2018
Goodwill    
Beginning balance $ 737,197 $ 498,520
Additions associated with acquisitions 10,604 250,120
Cumulative translation adjustment 272 (11,443)
Goodwill $ 748,073 $ 737,197