SCHEDULE II (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Allowance for Credit Losses
Balance at Beginning of Period	$ 1,691	$ 1,354	$ 1,525
Charged to (Reduction of) Costs and Expenses	223	437	189
Taken Against Allowance	(232)	(100)	(360)
Other (Deductions) Recoveries	0	0	0
Balance at End of Period	1,682	1,691	1,354
Valuation on Allowance for Deferred Tax Assets
Balance at Beginning of Period	14,625	16,889	8,754
Charged to (Reduction of) Costs and Expenses	(39)	656	8,135
Taken Against Allowance	(5,336)	(2,920)	0
Other (Deductions) Recoveries	0	0	0
Balance at End of Period	$ 9,250	$ 14,625	$ 16,889