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Earnings Per Share (Anti-dilutive Shares) (Details) - shares
shares in Thousands
3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Joint venture shares    
Anti-dilutive shares    
Anti-dilutive shares 298 298
3.00% convertible senior unsecured notes    
Anti-dilutive shares    
Anti-dilutive shares 16,992 16,992
Stated interest rates 3.00% 3.00%
Series J convertible perpetual preferred stock    
Anti-dilutive shares    
Anti-dilutive shares 15,635 15,635
1.50% convertible senior unsecured notes    
Anti-dilutive shares    
Anti-dilutive shares 11,567 11,567
Stated interest rates 1.50% 1.50%