SCHEDULE II - VALUATION AND QUALIFYING ACCOUNTS (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]
Balance at Beginning of Period	$ 253,758	$ 284,705	$ 373,288
Charged to Costs and Expenses	210,529	160,027	273,611
Charged to Other Accounts	0	0	0
Deductions from Reserves	(228,299)	(190,974)	(362,194)
Balance at End of Period	235,988	253,758	284,705
Allowance for Trade Receivables
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]
Balance at Beginning of Period	24,966	24,610	41,792
Charged to Costs and Expenses	180,764	159,140	222,819
Charged to Other Accounts	0	0	0
Deductions from Reserves	(180,755)	(158,784)	(240,001)
Balance at End of Period	24,975	24,966	24,610
Valuation Allowance of Net Deferred Taxes
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]
Balance at Beginning of Period	206,743	239,959	312,148
Charged to Costs and Expenses	2,603	(26,270)	18,413
Charged to Other Accounts	0	0	0
Deductions from Reserves	(16,036)	(6,946)	(90,602)
Balance at End of Period	193,310	206,743	239,959
Inventory Obsolescence Reserve
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]
Balance at Beginning of Period	22,049	20,136	19,348
Charged to Costs and Expenses	27,162	27,157	32,379
Charged to Other Accounts	0	0	0
Deductions from Reserves	(31,508)	(25,244)	(31,591)
Balance at End of Period	$ 17,703	$ 22,049	$ 20,136