Valuation and Qualifying Accounts and Allowances (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 at Beginning of Year	$ 18,466	$ 21,958	$ 25,378
Additions Charged to Operations	9,149	967	40,894
Net Deductions and Other	(11,685)	(4,459)	(44,314)
Balance at End of Year	15,930	18,466	21,958
Income Tax Valuation Allowances
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at Beginning of Year	610,560	365,820	580,937
Additions Charged to Operations	63,635	284,629	103,154
Net Deductions and Other	(42,281)	(39,889)	(318,271)
Balance at End of Year	$ 631,914	$ 610,560	$ 365,820