Convertible Preferred Stock (Notes)

6 Months Ended

Jun. 30, 2013

Convertible Preferred Stock [Abstract]

Convertible Preferred Stock

Convertible Preferred Stock

The conversion rate of our 5 ¹/4% 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 first quarter of 2013, the conversion rate per share for our Series B Preferred Stock was adjusted from 76.2197 to 77.1251 as a result of the cumulative effect of the cash dividends declared and paid on our common stock during the fourth quarter of 2012 and first quarter of 2013, resulting in a corresponding adjustment of the conversion price from $13.12 to $12.97. There was no additional adjustment required to the conversion rate in the second quarter of 2013.