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7. Earnings Per Share (Details) - shares
shares in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Basic weighted average shares outstanding 29,863 29,660 29,822 29,618
Effect of potentially dilutive stock options and restricted stock awards 429 392 412 376
Diluted weighted average common shares 30,292 30,052 30,234 29,994
Anti-dilutive shares 64 12 35 22