Income Taxes (Details) - Tax Year 2014 [Member] - USD ($) $ in Thousands	6 Months Ended
	Jun. 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	$ 2,300
Interest expense	$ 400