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Share Capital, Option Plans and Share-Based Payments - Additional Information (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	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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Aggregate dividends declared during the period for each share of common stock outstanding.

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The cash outflow to reacquire common stock during the period.

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Total number of nonredeemable preferred shares (or preferred stock redeemable solely at the option of the issuer) issued to shareholders (includes related preferred shares that were issued, repurchased, and remain in the treasury). May be all or portion of the number of preferred shares authorized. Excludes preferred shares that are classified as debt.

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