Valuation and Qualifying Accounts (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at Beginning of Year	$ 51,510	$ 44,829	$ 55,148
Additions	11,528	6,681	0
Deductions	0	0	(10,319)
Balance at End of Year	63,038	51,510	44,829
Allowance for doubtful accounts-note receivable
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at Beginning of Year		0	376
Additions			0
Deductions			(376)
Balance at End of Year			0
Tax valuation allowances
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at Beginning of Year	51,510	44,829	54,772
Additions	11,528	6,681	0
Deductions	0	0	(9,943)
Balance at End of Year	$ 63,038	$ 51,510	$ 44,829