Valuation and Qualifying Accounts (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Movement in Valuation Allowances and Reserves [Roll Forward]
Valuation Allowances and Reserves, Balance, Beginning Balance	$ 12,156	$ 12,080	$ 29,037
Valuation Allowances and Reserves, Charged to Costs and Expenses	14,587	3,006	3,569
Valuation Allowances and Reserves, Deductions	2,114	2,930	20,526
Valuation Allowances and Reserves, Balance, Ending Balance	$ 24,629	$ 12,156	$ 12,080