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
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Balance, beginning of period	$ 7,292	$ 7,451	$ 7,384	$ 6,960
Additions charged to expense	1,480	2,463	3,044	4,260
Write-offs charged against allowance	(238)	(816)	(795)	(1,542)
Recoveries of amounts previously written off	(995)	(519)	(2,094)	(1,099)
Balance, end of period	$ 7,539	$ 8,579	$ 7,539	$ 8,579