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Net Income Per Share (Tables)
 12 Months Ended
Dec. 31, 2019
Earnings Per Share [Abstract]  
Calculation of Net Income Per Share
The calculation of net income per share for the three years ended December 31, 2019, 2018 and 2017, are reflected in the following table (in thousands, except per share amounts):
 
Years Ended December 31,
 201920182017
Net income$454,433  $434,288  $290,584  
Basic:
       Weighted average shares115,656  120,513  124,152  
        Diluted:
        Weighted average shares115,656  120,513  124,152  
        Dilutive effect of potential common shares755  1,089  740  
        Diluted weighted average shares116,411  121,602  124,892  
Net income per share:
        Basic $3.93  $3.60  $2.34  
        Diluted $3.90  $3.57  $2.33