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Earnings Per Share (Anti-dilutive Shares) (Details) - shares
shares in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Joint venture shares      
Anti-dilutive shares      
Anti-dilutive shares 298 298 298
3.00% convertible senior unsecured notes      
Anti-dilutive shares      
Anti-dilutive shares 16,992 16,992 16,992
Series J convertible perpetual preferred stock      
Anti-dilutive shares      
Anti-dilutive shares 15,635 15,635 15,635
1.50% convertible senior unsecured notes      
Anti-dilutive shares      
Anti-dilutive shares 11,567 11,567 11,567