SCHEDULE II - VALUATION AND QUALIFYING ACCOUNTS (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Allowance for doubtful accounts
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at Beginning of Period	$ 12,701	$ 10,422	$ 8,701
Additions: Charged to Costs and Expenses	13,283	13,134	17,338
Deductions: Write-offs and recoveries	(9,966)	(10,855)	(15,617)
Balance at End of Period	16,018	12,701	10,422
Deferred tax asset valuation allowance
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at Beginning of Period	608	44	197
Additions: Charged to Costs and Expenses	9,456	595	0
Deductions: Write-offs and recoveries	(1,757)	(31)	(153)
Balance at End of Period	$ 8,307	$ 608	$ 44