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
VALUATION AND QUALIFYING ACCOUNTS
Balance at Beginning of Period	$ 61,782	$ 41,207	$ 44,376
Charged to Costs and Other Deductions	18,929	17,529	3,024
Charged to Other Accounts	(329)	(51)	(226)
Deductions	(10,575)	3,097	(5,967)
Balance at End of Period	69,807	61,782	41,207
Inventory reserve
VALUATION AND QUALIFYING ACCOUNTS
Balance at Beginning of Period	35,048	27,854	28,934
Charged to Costs and Other Deductions	5,082	11,808
Charged to Other Accounts			14,688
Deductions	(16,653)	(4,614)	(15,768)
Balance at End of Period	23,477	35,048	27,854
Valuation allowance on deferred tax assets
VALUATION AND QUALIFYING ACCOUNTS
Balance at Beginning of Period	2,780,001	1,917,390	1,869,490
Charged to Other Accounts	836,879	862,611	47,900
Balance at End of Period	$ 3,616,880	$ 2,780,001	$ 1,917,390