10 3/4% Series A and B Cumulative Exchangeable Redeemable Preferred Stock - Additional Information (Details) - USD ($) $ / shares in Units, $ in Thousands							12 Months Ended			61 Months Ended
	Oct. 15, 2013	Oct. 15, 2011	Oct. 15, 2010	Oct. 15, 2009	Apr. 05, 2004	Oct. 30, 2003	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2013	Oct. 30, 2008	Feb. 18, 2004
Class Of Stock [Line Items]
Series B preferred stock adjustment to contract settlement value at reporting date classified as interest expense							$ 9,700	$ 9,700	$ 87,600
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						$ 75,000
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
Liquidation preference per share							$ 1,000				$ 1,000
Shares of Series B preferred stock exchanged for Series A preferred stock					76,702
Purchase price percentage as of aggregate liquidation preference							101.00%
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%	10.75%
Increase in carrying value of preferred stock										$ 17,300
Stock requested to be repurchased	92,223
Purchase price of stock requested to be repurchased	$ 126,900
Stock repurchased	1,800
Purchase price of stock repurchased	$ 2,500
Offer price in cash as percentage of liquidation preference							101.00%
Aggregate cumulative unpaid dividends on outstanding shares							$ 65,299	$ 55,565