Schedule II (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Allowance for Doubtful Accounts
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Balance Beginning of Period	$ 1,246	$ 2,498	$ 2,181
Additions Charged to Costs and Expenses / Provision Benefit	1,391	788	767
Additions Other	82	0	0
Deductions	(711)	(2,040)	(450)
Balance End of Period	2,008	1,246	2,498
Valuation Allowance of Deferred Tax Assets
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Balance Beginning of Period	8,142	8,243	4,944
Additions Charged to Costs and Expenses / Provision Benefit	1,166	2,046	3,472
Additions Other	908		173
Deductions		(2,147)
Balance End of Period	$ 10,216	$ 8,142	$ 8,243