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8. Earnings Per Share (Details) - shares
shares in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Basic weighted average shares outstanding 29,814 29,814 29,807 29,801
Effect of potentially dilutive stock options and restricted stock awards 340 405 318 396
Diluted weighted average common shares 30,154 30,219 30,125 30,197
Anti-dilutive shares 41 13 217 13