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EARNINGS PER SHARE - Schedule of Earnings per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018
Earnings per share |  |  |  |
Income from continuing operations | $ 23,954 | $ 33,711 | $ 48,226 | $ 59,082
Income from discontinued operations | 1,494 | 320 | 857 | 197
Net income | $ 25,448 | $ 34,031 | $ 49,083 | $ 59,279
Average number of common shares issued (in shares) | 49,026 | 46,212 | 47,627 | 46,212
Less: average number of treasury shares (in shares) | 754 | 788 | 736 | 828
Less: average number of unvested stock award shares (in shares) | 354 | 435 | 384 | 428
Plus: average participating preferred shares (in shares) | 1,043 | 1,043 | 1,043 | 1,043
Average number of basic common shares outstanding (in shares) | 48,961 | 46,032 | 47,550 | 45,999
Average number of diluted common shares outstanding (in shares) | 49,114 | 46,215 | 47,700 | 46,206
Basic earnings per common share: |  |  |  |
Continuing operations (in dollars per share) | $ 0.49 | $ 0.73 | $ 1.01 | $ 1.29
Discontinued operations (in dollars per share) | 0.03 | 0.01 | 0.02 | 0
Total (in dollars per share) | 0.52 | 0.74 | 1.03 | 1.29
Diluted earnings per common share: |  |  |  |
Continuing operations (in dollars per share) | 0.49 | 0.73 | 1.01 | 1.28
Discontinued operations (in dollars per share) | 0.03 | 0.01 | 0.02 | 0
Total (in dollars per share) | $ 0.52 | $ 0.74 | $ 1.03 | $ 1.28
Unvested stock award shares |  |  |  |
Earnings per share |  |  |  |
Plus: dilutive effect of share-based payment arrangements (in shares) | 107 | 152 | 120 | 176
Stock options |  |  |  |
Earnings per share |  |  |  |
Plus: dilutive effect of share-based payment arrangements (in shares) | 46 | 31 | 30 | 31

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