Preferred Stock (Components of Dividends Declared and Undeclared and in Kind Dividends Deemed on Preferred Stock) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Dividends Payable [Line Items]
Dividends declared and undeclared and in kind dividends deemed on preferred stock	$ 578	$ 12,243	$ 20,748
Accrued At Stated Rate [Member] | Series A Preferred Stock [Member]
Dividends Payable [Line Items]
Dividends declared and undeclared and in kind dividends deemed on preferred stock			222
Accrued At Stated Rate [Member] | Series B Preferred Stock [Member]
Dividends Payable [Line Items]
Dividends declared and undeclared and in kind dividends deemed on preferred stock			243
Accrued At Stated Rate [Member] | Series C Preferred Stock [Member]
Dividends Payable [Line Items]
Dividends declared and undeclared and in kind dividends deemed on preferred stock			455
Accrued At Stated Rate [Member] | Series D Preferred Stock [Member]
Dividends Payable [Line Items]
Dividends declared and undeclared and in kind dividends deemed on preferred stock		650	3,090
Accrued At Stated Rate [Member] | Series E Preferred Stock [Member]
Dividends Payable [Line Items]
Dividends declared and undeclared and in kind dividends deemed on preferred stock	$ 578	483
Deemed Upon Notice Of Redemption [Member] | Series A Preferred Stock [Member]
Dividends Payable [Line Items]
Dividends declared and undeclared and in kind dividends deemed on preferred stock			652
Deemed Upon Notice Of Redemption [Member] | Series B Preferred Stock [Member]
Dividends Payable [Line Items]
Dividends declared and undeclared and in kind dividends deemed on preferred stock			668
Deemed At Exchange [Member] | Series C Preferred Stock [Member]
Dividends Payable [Line Items]
Dividends declared and undeclared and in kind dividends deemed on preferred stock			$ 15,418
Inducement To Convert [Member] | Series D Preferred Stock [Member]
Dividends Payable [Line Items]
Dividends declared and undeclared and in kind dividends deemed on preferred stock		$ 11,110