Preferred Stock - Additional Information (Details) (USD $)	1 Months Ended	3 Months Ended				1 Months Ended	3 Months Ended		1 Months Ended	3 Months Ended
	Aug. 29, 2012	Dec. 31, 2013	Sep. 30, 2013	Dec. 31, 2012	Aug. 29, 2012 Exchanged for Preferred Stock	Aug. 29, 2012 Common Stock	Dec. 31, 2013 Common Stock	Sep. 30, 2013 Common Stock	Aug. 29, 2012 Series B Cumulative Perpetual Convertible Preferred Stock	Dec. 31, 2013 Series B Cumulative Perpetual Convertible Preferred Stock	Sep. 30, 2013 Series B Cumulative Perpetual Convertible Preferred Stock
Class of Stock [Line Items]
Preferred stock to debt and common stock exchange (in shares)		183,496							982,361		233,843
Conversion of stock, shares Issued								3,316,922
Preferred stock to common stock exchange (in shares)						5,866,821
Convertible senior notes	$ 112,500,000				$ 63,227,000
Preferred stock, shares outstanding	417,639	0		417,639						0
Preferred stock, cumulative dividend rate (in percent)	7.50%								7.50%
Preferred stock, par value	$ 0.01	$ 0.01		$ 0.01					$ 0.01
Conversion rate of the preferred stock to common stock		14.1844	14.1844
Redemption of preferred stock (in shares)										300
Preferred stock conversions, inducements								75,342
Common stock issuable upon conversion, shares							2,602,770
Payments for repurchase of convertible preferred stock										$ 30,000