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8. Earnings Per Share (Details) - shares
shares in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Basic weighted average shares outstanding 29,660 29,444 29,618 29,402
Effect of potentially dilutive stock options and restricted stock awards 392 227 376 190
Diluted weighted average common shares 30,052 29,671 29,994 29,592
Anti-dilutive shares 12 50 22 77