Accounts Receivable and Allowance for Doubtful Accounts (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Allowance For Doubtful Accounts And Unbilled Services [Abstract]
Provision for doubtful accounts	$ 7,800	$ 2,500	$ 11,624	$ 6,260
Accounts receivable, writeoff	$ 7,500	$ 3,400	$ 13,500	$ 5,900