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
VALUATION AND QUALIFYING ACCOUNTS
Balance at Beginning of period	$ 41,207	$ 44,376	$ 43,757
Charged to Costs and Other Deductions	17,529	3,024	2,544
Charged to Other Accounts	(51)	(226)	86
Deductions	3,097	(5,967)	(2,011)
Balance at End of Period	61,782	41,207	44,376
Inventory reserve
VALUATION AND QUALIFYING ACCOUNTS
Balance at Beginning of period	27,854	28,934	26,537
Charged to Costs and Other Deductions	11,808		5,897
Charged to Other Accounts		14,688
Deductions	(4,614)	(15,768)	(3,500)
Balance at End of Period	35,048	27,854	28,934
Valuation allowance on deferred tax assets
VALUATION AND QUALIFYING ACCOUNTS
Balance at Beginning of period	1,917,390	1,869,490	1,807,728
Charged to Other Accounts	862,611	47,900	61,762
Balance at End of Period	$ 2,780,001	$ 1,917,390	$ 1,869,490