Preferred Stock (Components of Dividends Declared and in Kind Dividends Deemed on Preferred Stock) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Dividends Payable [Line Items]
Dividends declared and in kind dividends deemed on preferred stock	$ 145	$ 205	$ 434	$ 12,079
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	145	$ 434	339
Inducement To Convert [Member] | Series D Preferred Stock [Member]
Dividends Payable [Line Items]
Dividends declared and in kind dividends deemed on preferred stock		$ 60		$ 11,090