Allowance Accounts - Summary Of Activity In Valuation Accounts (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Allowance for Credit Losses
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at the beginning of year	$ 0	$ 0	$ 2,752
Additions	2,684
Deductions			(2,752)
Adjustments	785	0	0
Balance at the end of year	3,469	0	0
Deferred Tax Asset Valuation Allowance
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at the beginning of year	18,631	17,940	12,337
Additions	0
Deductions			0
Adjustments	1,091	691	5,603
Balance at the end of year	$ 19,722	$ 18,631	$ 17,940