Ten Point Seven Five Percent Series B Cumulative Exchangeable Redeemable Preferred Stock (Details Textual) - USD ($) $ / shares in Units, $ in Millions							3 Months Ended	12 Months Ended
	Oct. 15, 2013	Oct. 15, 2011	Oct. 15, 2010	Oct. 15, 2009	Apr. 05, 2004	Oct. 30, 2003	Mar. 31, 2016	Dec. 31, 2015	Feb. 18, 2004
Class Of Stock [Line Items]
Dividends on the Series B preferred stock							10.75%	10.75%
Series A Preferred Stock
Class Of Stock [Line Items]
Preferred stock par value per share						$ 0.01
Liquidation preference per share						$ 1,000
Gross proceeds from the issuance of Series A preferred Stock						$ 75.0
Series A Preferred Stock | Private Placement
Class Of Stock [Line Items]
Preferred stock, shares issued						75,000
Series B Preferred Stock
Class Of Stock [Line Items]
Preferred stock, shares issued							90,549	90,549
Preferred stock par value per share							$ 0.01		$ 0.01
Liquidation preference per share							$ 1,000		$ 1,000
Shares of Series B preferred stock exchanged for Series A preferred stock					76,702
Rate of redemption of Preferred stock for cash		100.00%	101.792%	103.583%
Rate of redemption of Preferred stock at purchase price							100.00%
Dividends on the Series B preferred stock							10.75%
Increase in carrying value of preferred stock		$ 17.3
Stock requested to be repurchased	92,223
Purchase price of stock requested to be repurchased	$ 126.9
Stock repurchased	1,800
Purchase price of stock repurchased	$ 2.5
Preferred stock outstanding carrying value							$ 58.0