Quarterly report pursuant to Section 13 or 15(d)

Net Income Per Share (Details)

v3.19.1
Net Income Per Share (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Earnings Per Share, Basic, Two Class Method [Abstract]    
Net income and comprehensive income $ 18,407 $ 17,741
Income allocated to participating securities (208) (145)
Numerator for basic and diluted income per share - net income $ 18,199 $ 17,596
Denominator for basic income per share - weighted-average shares 28,530 29,375
Denominator for diluted income per share - adjusted weighted-average shares 28,648 29,480
Basic income per share (dollars per share) $ 0.64 $ 0.60
Diluted income per share (dollars per share) $ 0.64 $ 0.60
Total number anti-dilutive options, non-vested shares, and performance shares excluded from income per diluted share computation 203 87
Equity Option [Member]    
Earnings Per Share, Basic, Two Class Method [Abstract]    
Effect of dilutive stock options and non-vested shares 76 70
Total number anti-dilutive options, non-vested shares, and performance shares excluded from income per diluted share computation 195 67
Key Employee Performance Share Based Plan [Member]    
Earnings Per Share, Basic, Two Class Method [Abstract]    
Effect of dilutive stock options and non-vested shares 42 35
Total number anti-dilutive options, non-vested shares, and performance shares excluded from income per diluted share computation 8 11
Nonvested Shares and Deferred Stock Units [Member]    
Earnings Per Share, Basic, Two Class Method [Abstract]    
Total number anti-dilutive options, non-vested shares, and performance shares excluded from income per diluted share computation   9