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Earnings per share ("EPS") (Details) - USD ($)
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Earnings per share    
Basic EPS - Earnings $ 194,700,000 $ 122,200,000
Basic EPS - (in shares) 182,900,000 175,200,000
Basic EPS (in dollars per share) $ 1.06 $ 0.70
Effect of dilutive securities - (in shares) 400,000 1,200,000
Effect of dilutive securities - (in dollars per share)   $ (0.01)
Diluted EPS - Earnings $ 194,700,000 $ 122,200,000
Diluted EPS - (in shares) 183,300,000 176,400,000
Diluted EPS (in dollars per share) $ 1.06 $ 0.69
Stock options    
Earnings per share    
Securities excluded from computation of diluted EPS (in shares) 5,626 0
Warrants    
Earnings per share    
Securities excluded from computation of diluted EPS (in shares) 1,194 0
Restricted shares    
Earnings per share    
Securities excluded from computation of diluted EPS (in shares) 73,947 84,094