Quarterly report pursuant to Section 13 or 15(d)

Net Income Per Share - Calculation of net income per share (Details)

v3.10.0.1
Net Income Per Share - Calculation of net income per share (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Numerator (both basic and diluted)        
Net income relevant to common stockholders $ 46,285 $ 21,965 $ 122,084 $ 2,535
Denominator        
Denominator for basic earnings (loss) per share (in shares) 83,544 83,040 83,359 74,124
Denominator for diluted income (loss) per share (in shares) 86,878 86,264 87,153 77,118
Basic income (loss) per common share (in dollars per share) $ 0.55 $ 0.26 $ 1.46 $ 0.03
Diluted income (loss) per common share (in dollars per share) $ 0.53 $ 0.25 $ 1.40 $ 0.03
Stock options        
Denominator        
Dilutive effect of share based payment (in shares) 3,039 2,808 3,355 2,822
Performance stock units        
Denominator        
Dilutive effect of share based payment (in shares) 225 37 218 0
Non-vested restricted stock        
Denominator        
Dilutive effect of share based payment (in shares) 70 379 221 172