Schedule II (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at Beginning of Year		$ 0
Additions	[1]	316
Deductions		0
Balance at End of Year		316	$ 0
Allowance for Doubtful Accounts [Member]
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at Beginning of Year		0	257	$ 0
Additions	[1]	0	0	257
Deductions		0	(257)	0
Balance at End of Year		0	0	$ 257
Allowance for Expected Credit Losses [Member]
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at Beginning of Year		0
Additions	[1]	316
Deductions		0
Balance at End of Year		$ 316	$ 0

[1] Amount expensed in included within Selling, general and administrative.