Valuation and Qualifying Accounts and Allowances (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Allowance for Doubtful Accounts
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at Beginning of Year	$ 21,958	$ 25,378	$ 21,376
Additions Charged to Operations	967	40,894	17,568
Net Deductions and Other	(4,459)	(44,314)	(13,566)
Balance at End of Year	18,466	21,958	25,378
Income Tax Valuation Allowances
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at Beginning of Year	365,820	580,937	74,125
Additions Charged to Operations	284,629	103,154	514,661
Net Deductions and Other	(39,889)	(318,271)	(7,849)
Balance at End of Year	$ 610,560	$ 365,820	$ 580,937