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CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) - $ / shares
shares in Thousands
6 Months Ended
Jun. 30, 2018
Dec. 31, 2017
CONDENSED CONSOLIDATED BALANCE SHEETS    
Preferred stock, par value (in dollars per share) $ 0.001  
Preferred stock, rate (as a percent) 6.00%  
Preferred stock, liquidation preference (in dollars per share) $ 50  
Preferred stock, shares issued 5,750  
Common shares, par value (in dollars per share) $ 0.001 $ 0.001
Common shares, shares authorized 800,000 800,000
Common shares, shares issued 410,252 367,510
Treasury shares, at cost 52,800 52,800