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Share Capital, Option Plans and Share-Based Payments - Additional Information (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended
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Sep. 30, 2019 | Sep. 30, 2018
Cash Dividends |  |
Dividends declared per common share (in dollars per share) | $ 0.1746 | $ 0.1518
Payments of dividends | $ 47,006 | $ 40,466
Share Capital |  |
Preference shares issued (in shares) | 0 |
Treasury Stock |  |
Purchase of treasury stock (in shares) | 300,000 | 304,000
Purchase of treasury stock | $ 12,424 | $ 11,719
Issuance of treasury stock (in shares) | 0 | 2,968

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