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6. Earnings Per Share (Tables)
6 Months Ended
Jun. 30, 2017
Earnings per share:  
Computation of basic and diluted earnings per share
    Three Months Ended     Six Months Ended
    June 30,     June 30,
    2017     2016     2017     2016
    (In thousands)     (In thousands)
Weighted average number of common shares outstanding during the period used to compute basic earnings per share     23,076       24,538       23,296     24,917
Incremental common shares attributable to exercise of outstanding options and warrants     4,526       4,573       4,728     4,715
Weighted average number of common shares used to compute diluted earnings per share     27,602       29,111       28,024     29,632