Schedule II - Consolidated Valuation and Qualifying Accounts (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Allowance for credit loss	$ 15,474	$ 12,781	$ 8,325
Allowance for Doubtful Accounts
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at beginning of period	12,781	8,325	9,156
Charged to costs and expenses	7,042	4,678	542
Charged to other accounts	0	0	0
Deductions	$ (4,349)	(222)	(1,373)
Balance at end of period		$ 12,781	$ 8,325