Schedule V - Valuation and Qualifying Accounts (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Movement in valuation and qualifying accounts
Balance at Beginning of Period	$ 1,754	$ 578	$ 482
Charged to Costs and Expenses	2,339	3,294	1,358
Deductions	2,285	2,118	1,262
Balance at End of Period	$ 1,808	$ 1,754	$ 578