Debt - Redemption Price Percentages (Details) (Senior Notes)	9 Months Ended							0 Months Ended
	Sep. 30, 2013 8.75% Senior Notes, due July 2021 Redemption period using cash proceeds from equity offerings	Sep. 30, 2013 8.75% Senior Notes, due July 2021 Period prior to 2017 redemption date	Sep. 30, 2013 8.75% Senior Notes, due July 2021 12 Month period starting with 2017 redemption date	Sep. 30, 2013 8.75% Senior Notes, due July 2021 12 Month period starting with 2018 redemption date	Sep. 30, 2013 8.75% Senior Notes, due July 2021 Period thereafter starting with 2019 redemption date	Sep. 30, 2013 8.75% Senior Notes, due July 2021 Period Of Change Of Control	Sep. 30, 2013 8.75% Senior Notes, due July 2021 Period Of Certain Asset Sales	Oct. 01, 2013 Subsequent Event 7.5% Senior Notes, due October 2021 Redemption period using cash proceeds from equity offerings	Oct. 01, 2013 Subsequent Event 7.5% Senior Notes, due October 2021 Period prior to 2016 redemption date	Oct. 01, 2013 Subsequent Event 7.5% Senior Notes, due October 2021 12 Month period starting with 2016 redemption date	Oct. 01, 2013 Subsequent Event 7.5% Senior Notes, due October 2021 12 Month period starting with 2017 redemption date	Oct. 01, 2013 Subsequent Event 7.5% Senior Notes, due October 2021 12 Month period starting with 2018 redemption date	Oct. 01, 2013 Subsequent Event 7.5% Senior Notes, due October 2021 Period thereafter starting with 2019 redemption date	Oct. 01, 2013 Subsequent Event 7.5% Senior Notes, due October 2021 Period Of Change Of Control	Oct. 01, 2013 Subsequent Event 7.5% Senior Notes, due October 2021 Period Of Certain Asset Sales
Debt Instrument, Redemption [Line Items]
Redemption Price, Percentage	108.75%	100.00%	104.375%	102.188%	100.00%	101.00%	100.00%	107.50%	100.00%	105.625%	103.75%	101.875%	100.00%	101.00%	100.00%
Amount Required To Be Outstanding After Redemption, Percentage	65.00%							65.00%
Maximum Days Redemption Required Following Equity Offering, Days	180 days							180 days