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Earnings Per Share (Anti-dilutive Shares) (Details) - shares
shares in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
3.00% convertible senior unsecured notes        
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Anti-dilutive shares 0 16,992 0 16,992
Stated interest rates 3.00%   3.00%  
Series J convertible perpetual preferred stock        
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Anti-dilutive shares 0 15,635 0 15,635
1.50% convertible senior unsecured notes        
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Anti-dilutive shares 0 11,567 0 11,567
Stated interest rates 1.50%   1.50%  
Joint venture shares        
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Anti-dilutive shares 0 298 0 298
Performance Shares        
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Anti-dilutive shares 25   128