Quarterly report pursuant to Section 13 or 15(d)

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

v3.20.1
Net Income Per Share - Calculation of net income per share (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Sep. 30, 2019
Sep. 30, 2018
Numerator (both basic and diluted)                
Net income relevant to common stockholders $ 34,397 $ 36,133 $ 69,805 $ 46,285 $ 39,091 $ 36,708 $ 140,335 $ 122,084
Denominator                
Denominator for basic earnings (loss) per share (in shares) 100,606,000     83,544,000     100,423,000 83,359,000
Denominator for diluted income (loss) per share (in shares) 103,652,000     86,878,000     103,988,000 87,153,000
Basic income (loss) per common share (in dollars per share) $ 0.34     $ 0.55     $ 1.40 $ 1.46
Diluted income (loss) per common share (in dollars per share) $ 0.33     $ 0.53     $ 1.35 $ 1.40
Antidilutive securities excluded from computation of earnings per share, amount (in shares) 702,170              
Stock options                
Denominator                
Dilutive effect of share based payment (in shares) 2,750,000     3,039,000     3,114,000 3,355,000
Performance stock units                
Denominator                
Dilutive effect of share based payment (in shares) 184,000     225,000     183,000 218,000
Non-vested restricted stock                
Denominator                
Dilutive effect of share based payment (in shares) 112,000     70,000     268,000 221,000