SCHEDULE II - VALUATION AND QUALIFYING ACCOUNTS (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Allowance for doubtful accounts and revenue reserves
Movement in Valuation Allowances and Reserves
Balance at Beginning of Period	$ 16,603	$ 9,263	$ 9,177
Charges to Earnings	64,278	47,242	27,514
Charges to Other Accounts	(48)	(506)	271
Deductions	(60,540)	(39,396)	(27,699)
Balance at End of Period	20,293	16,603	9,263
Deferred tax valuation allowance
Movement in Valuation Allowances and Reserves
Balance at Beginning of Period	58,903	61,563	14,180
Charges to Earnings	14,083	(599)	42,310
Charges to Other Accounts	(1,514)	(2,061)	5,073
Deductions	0	0	0
Balance at End of Period	71,472	58,903	$ 61,563
Other reserves
Movement in Valuation Allowances and Reserves
Balance at Beginning of Period	3,919
Balance at End of Period	$ 5,057	$ 3,919