Preferred Stock (Components Of Dividends Declared And Undeclared And In Kind Dividends Deemed On Preferred Stock) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Dividends Payable [Line Items]
Dividends declared and undeclared and in kind dividends deemed on preferred stock	$ 11,603	$ 17,740
Accrued At Stated Rate [Member] | Preferred Stock Series A [Member]
Dividends Payable [Line Items]
Dividends declared and undeclared and in kind dividends deemed on preferred stock		190
Accrued At Stated Rate [Member] | Redeemable Preferred Stock Series B [Member]
Dividends Payable [Line Items]
Dividends declared and undeclared and in kind dividends deemed on preferred stock		208
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	160
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	50
Deemed Upon Redemption [Member] | Preferred Stock Series A [Member]
Dividends Payable [Line Items]
Dividends declared and undeclared and in kind dividends deemed on preferred stock		646
Deemed Upon Redemption [Member] | Redeemable Preferred Stock Series B [Member]
Dividends Payable [Line Items]
Dividends declared and undeclared and in kind dividends deemed on preferred stock		662
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		$ 15,419
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	$ 10,903