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Preferred Stock (Details) (USD $)	0 Months Ended	3 Months Ended		12 Months Ended
Preferred Stock (Details) (USD $)	Mar. 12, 2015	Mar. 31, 2015	Mar. 31, 2014	Dec. 31, 2014	Mar. 12, 2015
Series 2009 Preferred Stock [Member]
Class of Stock [Line Items]
Preferred stock, dividend rate, percentage	8.00%	0.00%	8.00%	8.00%
Preferred stock, par value (in dollars per share)	$ 1.00	$ 0	$ 1.00	$ 1.00	$ 1.00
Liquidation preference per share	$ 1,000				$ 1,000
Series 2011 Preferred Stock [Member]
Class of Stock [Line Items]
Preferred stock, dividend rate, percentage		0.00%	8.00%	8.00%
Preferred stock, par value (in dollars per share)	$ 1.00	$ 0	$ 1.00	$ 1.00	$ 1.00
Liquidation preference per share	$ 500				$ 500

The per share liquidation preference (or restrictions) of nonredeemable preferred stock (or preferred stock redeemable solely at the option of the issuer) that has a preference in involuntary liquidation considerably in excess of the par or stated value of the shares. The liquidation preference is the difference between the preference in liquidation and the par or stated values of the share.

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