Equity Compensation, Employment Agreements and Other Benefit Plans (Deferred Compensation Plans) (Details) - Deferred Compensation Plans - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]
Deferrable compensation by the employee, maximum	100.00%
Expenses related to Deferred Plans	$ 171	$ 231	$ (59)
Cash distributed to the participants	0	122	109
Undistributed Income Deferred	1,688	1,066
Liability Under Deferred Plans	2,056	1,263
Non-employee directors
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]
Expenses related to Deferred Plans	171	231	$ (59)
Undistributed Income Deferred	1,688	1,066
Liability Under Deferred Plans	$ 2,056	$ 1,263