Series B Redeemable Preferred Stock (Details) - Jun. 30, 2015 $ / shares in Units, $ in Millions	USD ($) item $ / shares shares	$ / shares shares
Class of Stock [Line Items]
Annual dividend rate	6.25%
Preferred stock, liquidation preference per share	$ 10.00	$ 10.00
Number of directors entitled to shareholders | item	2
Redeemable Preferred Stock Series B [Member]
Class of Stock [Line Items]
Preferred stock, shares outstanding | shares	332,500	332,500
Annual dividend rate	10.00%	10.00%
Preferred stock, fixed annual amount of dividend per share	$ 2.50
Preferred stock, liquidation preference per share	25.00	$ 25.00
Preferred stock, redemption price	$ 25.00	$ 25.00
Accumulated but unpaid dividends | $	$ 1.5
Accumulated but unpaid dividends per share	$ 4.375