Schedule II - Valuation and Qualifying Accounts - Valuation and Qualifying Accounts (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2021	Dec. 31, 2020
SEC Schedule, 12-09, Allowance, Credit Loss [Member]
Balance at beginning of period		$ 563	$ 438
Recovered from/charged to costs and expenses		128	330
Deductions	[1]	127	205
Balance at end of period		564	563
SEC Schedule, 12-09, Valuation Allowance, Deferred Tax Asset [Member]
Balance at beginning of period		397	2,511
Recovered from/charged to costs and expenses		81	44
Deductions	[1]		2,158
Balance at end of period		$ 478	$ 397

[1] Uncollectible accounts written off, net of recoveries.