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Subsequent Events	3 Months Ended
Subsequent Events	Mar. 31, 2013
Subsequent Events [Abstract]
Subsequent Events	Subsequent Events During April 2013, the Company completed an offering of $500 million of 5½% Senior Notes due 2023 in connection with a cash tender offer to purchase any and all of the outstanding $450 million of the 9⅝% notes due 2018 and a portion of its outstanding 9¾% notes due 2020. The 5½% Senior Notes due 2023 were issued at par and will pay interest semi-annually on April 1 and October 1. The tender offer expired on April 16, 2013, and approximately $326 million in aggregate principal amount of the 9⅝% notes due 2018 and approximately $26 million of the aggregate principal amount of the 9¾% notes due 2020 were purchased by the Company.