Schedule II - Valuation and Qualifying Accounts - Summary of Valuation and Qualifying Accounts (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
SEC Schedule, 12-09, Allowance, Credit Loss [Member]
Balance at Beginning of Period	$ 1,940	$ 1,610	$ 1,385
Additions Charged to Costs and Expenses	590	575	641
Additions Charged to Other Accounts
Deductions	(565)	(245)	(416)
Balance at End of Period	1,965	1,940	1,610
SEC Schedule, 12-09, Valuation Allowance, Deferred Tax Asset [Member]
Balance at Beginning of Period	2,055	2,379	2,017
Additions Charged to Costs and Expenses	160		362
Additions Charged to Other Accounts
Deductions		(324)
Balance at End of Period	$ 2,215	$ 2,055	$ 2,379