Preferred Stock (Series B Preferred Stock) (Narrative) (Details) - Series B Preferred Stock [Member] - USD ($) $ / shares in Units, $ in Thousands		3 Months Ended	12 Months Ended
	Apr. 15, 2016	Mar. 31, 2016	Dec. 31, 2015	Jun. 03, 2008
Class of Stock [Line Items]
Preferred stock, shares outstanding	332,500	332,500	332,500
Preferred stock, annual dividend rate		10.00%	10.00%
Shares issued, price per share				$ 25.00
Preferred stock, liquidation preference per share		$ 25.00
Preferred stock, fixed annual amount of dividend per share		$ 2.50
Dividends unpaid and accrued		$ 2,078	$ 1,870
Dividends unpaid and accrued per share	$ 6.354167	$ 6.250	$ 5.625
Redemption liability		$ 10,391
Change in value of preferred stock		2,740
Change in net earnings available to common shareholders		$ (870)
Preferred stock, redemption price	25.00	$ 25.00
Subsequent Event [Member]
Class of Stock [Line Items]
Preferred stock, liquidation preference per share	25.00
Preferred stock, redemption price	$ 31.354