Schedule II - Valuation and Qualifying Accounts (Details) - Deferred tax valuation allowances - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Valuation allowances and reserves [Roll Forward]
Balance at Beginning of Period	$ 13,579	$ 12,881
Charged to Costs and Expenses	639	699
Charged to Other Accounts	1	(1)
Deductions	0	0
Balance at End of Period	$ 14,219	$ 13,579