Preferred Stock (Components of Dividends Declared and in Kind Dividends Deemed on Preferred Stock) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Dividends Payable [Line Items]
Dividends declared and in kind dividends deemed on preferred stock	$ 144	$ 11,603
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	$ 144	50
Inducement To Convert [Member] | Series D Preferred Stock [Member]
Dividends Payable [Line Items]
Dividends declared and in kind dividends deemed on preferred stock		$ 10,903