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6. Earnings Per Share (Tables)
3 Months Ended
Mar. 31, 2017
Earnings per share:  
Computation of basic and diluted earnings per share
    Three Months Ended  
    March 31,  
    2017     2016  
    (In thousands)  
Weighted average number of common shares outstanding during the period used to compute basic earnings per share   $ 23,517     $ 25,296  
Incremental common shares attributable to exercise of outstanding options and warrants     4,706       4,858  
Weighted average number of common shares used to compute diluted earnings per share   $ 28,223     $ 30,154