Stock-Based Compensation (Stock-Based Compensation Expense Recognized in General and Administrative Expenses) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Total compensation cost	$ 669	$ 759	$ 1,641
2005 Compensation Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Total compensation cost	277	759	1,641
2016 Compensation Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Total compensation cost	$ 392	$ 0	$ 0