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Consolidated Balance Sheets (Parenthetical) - $ / shares
Dec. 31, 2015
Dec. 31, 2014
Preferred stock, shares authorized (in shares) 100,000,000 100,000,000
Preferred stock, shares outstanding (in shares) 0 0
Common stock, par value (in dollars per share) $ 0.01 $ 0.01
Common stock, shares authorized (in shares) 300,000,000 300,000,000
Common stock, shares issued (in shares) 80,563,291 80,563,291
Common stock held in treasury (in shares) 6,099,078 2,541,306
Series A Preferred Stock    
Preferred stock, shares authorized (in shares) 10,896,250 10,896,250