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Earnings Per Share (Anti-dilutive Shares) (Details)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
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
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 0