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Earnings Per Share (Anti-dilutive Shares) (Details) - shares
 3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Anti-dilutive shares        
Anti-dilutive shares   21    
Joint venture shares        
Anti-dilutive shares        
Anti-dilutive shares [1],[2] 298,000 0 298,000 298,000
3.00% convertible senior unsecured notes        
Anti-dilutive shares        
Anti-dilutive shares [1],[2] 16,992,000 0 16,992,000 16,992,000
Series J convertible perpetual preferred stock        
Anti-dilutive shares        
Anti-dilutive shares [1],[2] 15,635,000 0 15,635,000 15,635,000
1.50% convertible senior unsecured notes        
Anti-dilutive shares        
Anti-dilutive shares [1],[2] 11,567,000 0 11,567,000 11,567,000
[1] For the three and nine months ended September 30, 2015 and for the nine months ended September 30, 2014, the effect of the Company's unvested Units, performance-based Units, CSEs and restricted stock awards were anti-dilutive.
[2] For the three months ended September 30, 2014, the effect of 21 unvested performance-based Units were anti-dilutive.