Income Taxes (Details) - Tax Year 2014 [Member] - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
	Sep. 30, 2018	Sep. 30, 2018	Dec. 31, 2015
Operating Loss Carryforwards [Line Items]
Net reduction in taxes due to the federal government		$ 17,600
Income tax refund receivable	$ 3,700	3,700	$ 2,300
Interest expense	$ 100	$ 500