Subsequent Events - Additional Information (Details) (USD $)	9 Months Ended				0 Months Ended			0 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013 Senior Notes 10.5% Senior Notes, due October 2017	Sep. 17, 2013 Senior Notes 10.5% Senior Notes, due October 2017	Oct. 01, 2013 Subsequent Event Senior Notes 7.5% Senior Notes, due October 2021	Oct. 01, 2013 Subsequent Event Senior Notes 10.5% Senior Notes, due October 2017	Oct. 01, 2013 Expected Date, Nov 2013 Subsequent Event Senior Notes 10.5% Senior Notes, due October 2017	Oct. 17, 2013 Hercules Resilience Subsequent Event
Subsequent Event [Line Items]
Debt Instrument, Issuance Date					Oct. 01, 2013
Debt Instrument, Face Amount				$ 300,000,000	$ 300,000,000	$ 300,000,000	$ 46,400,000
Debt instrument percentage rate			10.50%		7.50%
Debt Instrument, Repurchased Face Amount						253,600,000
Debt Instrument, Repurchase Amount						268,500,000	48,800,000
Additions of Property and Equipment	$ 307,135,000	$ 82,150,000						$ 166,900,000