Estimated Credit Losses (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Beginning Balance	$ 5,992	$ 5,610	$ 4,447
Adjustment due to the adoption of Topic 326	289	0	0
Provision for credit losses	2,924	1,107	2,257
Write-off of uncollectible amounts, net of recoveries	(364)	(725)	(1,094)
Ending Balance	$ 8,841	$ 5,992	$ 5,610