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 Beginning of Period	$ 22,493	$ 26,368	$ 16,173
Additions Charged to Operating Expense	10,133	2,408	15,817
Deductions from Reserves	7,992	6,283	5,622
Balance End of Period	24,634	22,493	26,368
Revenue Allowance
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Balance Beginning of Period	16,218	17,947	11,626
Additions Charged to Operating Expense	45,784	35,549	41,338
Deductions from Reserves	41,887	37,278	35,017
Balance End of Period	20,115	16,218	17,947
Valuation Allowance on Deferred Tax Assets
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Balance Beginning of Period	83,643	79,295	68,355
Additions Charged to Operating Expense	(11,339)	4,459	10,466
Deductions from Reserves	4,740	(111)	474
Balance End of Period	$ 77,044	$ 83,643	$ 79,295