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Convertible Preferred Stock (Notes)	9 Months Ended
Convertible Preferred Stock (Notes)	Sep. 30, 2013
Convertible Preferred Stock [Abstract]
Convertible Preferred Stock	Convertible Preferred Stock The conversion rate of our 5¹/4% Series B Cumulative Convertible Perpetual Preferred Stock (the "Series B Preferred Stock")is subject to adjustment upon the occurrence of certain events, including the payment of cash dividends on our common stock. During the third quarter of 2013, the conversion rate per share for our Series B Preferred Stock was adjusted from 77.1251 to 77.8966 as a result of the cumulative effect of the cash dividends declared and paid on our common stock during the second and third quarters of 2013, resulting in a corresponding adjustment of the conversion price from $12.97 to $12.84. See Note 14 for further information regarding subsequent events.