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6. Earnings Per Share (Tables)
9 Months Ended
Sep. 30, 2018
Earnings per share:  
Schedule of computation of basic and diluted earnings per share
    Three Months Ended     Nine Months Ended  
    September 30,     September 30,  
    2018     2017     2018     2017  
    (In thousands)     (In thousands)  
Weighted average number of common shares outstanding during the period used to compute basic earnings per share     22,636       22,473       21,800       23,019  
                                 
Incremental common shares attributable to exercise of outstanding options and warrants     2,099       4,306       3,378       4,587  
                                 
Weighted average number of common shares used to compute diluted earnings per share     24,735       26,779       25,178       27,606