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6. Earnings Per Share (Tables)
9 Months Ended
Sep. 30, 2016
Earnings per share:  
Computation of basic and diluted earnings per share
   Three Months Ended   Nine Months Ended 
   September 30,   September 30, 
   2016   2015   2016   2015 
   (In thousands)   (In thousands) 
Weighted average number of common shares outstanding during the period used to compute basic earnings per share   23,894    26,093    24,574    25,989 
                     
Incremental common shares attributable to exercise of outstanding options and warrants   4,609    5,383    4,679    5,807 
                     
Weighted average number of common shares used to compute diluted earnings per share   28,503    31,476    29,253    31,796