Preferred Stock (Components of Dividends Declared and in Kind Dividends Deemed on Preferred Stock) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Dividends Payable [Line Items]
Dividends declared and in kind dividends deemed on preferred stock	$ 145	$ 271	$ 289	$ 11,874
Accrued At Stated Rate [Member] | Series D Preferred Stock [Member]
Dividends Payable [Line Items]
Dividends declared and in kind dividends deemed on preferred stock				650
Accrued At Stated Rate [Member] | Series E Preferred Stock [Member]
Dividends Payable [Line Items]
Dividends declared and in kind dividends deemed on preferred stock	$ 145	144	$ 289	194
Inducement To Convert [Member] | Series D Preferred Stock [Member]
Dividends Payable [Line Items]
Dividends declared and in kind dividends deemed on preferred stock		$ 127		$ 11,030