Series A Preferred Stock (Details) $ / shares in Units, $ in Millions		3 Months Ended	6 Months Ended
	Dec. 30, 2005 $ / shares shares	Jun. 30, 2015 USD ($) item $ / shares shares	Jun. 30, 2015 $ / shares shares	Feb. 29, 2012 shares
Class of Stock [Line Items]
Preferred stock, shares sold | shares				3,000,000
Annual dividend rate		6.25%
Preferred stock, liquidation preference per share		$ 10.00	$ 10.00
Number of directors entitled to shareholders | item		2
Preferred Stock Series A [Member]
Class of Stock [Line Items]
Preferred stock, shares sold | shares	1,521,258
Annual dividend rate	8.00%		8.00%
Preferred stock, shares outstanding | shares		803,270	803,270
Preferred stock, liquidation preference per share	$ 10.00
Preferred stock, fixed annual amount of dividend per share	$ 0.80
Preferred stock, redemption price		$ 10.00	$ 10.00
Accumulated but unpaid dividends | $		$ 1.1
Accumulated but unpaid dividends per share		$ 1.35