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Goodwill Changes in the Carrying Value of Goodwill (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Goodwill Roll Forward        
Net carrying value at beginning of period $ 513,355 $ 289,586 $ 456,418 $ 289,586
Acquisitions and adjustments 0 41,301 56,937 41,301
Net carrying value at end of period $ 513,355 $ 330,887 $ 513,355 $ 330,887