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CONDENSED CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY - USD ($) $ in Thousands | Total | Common Shares and Additional Paid in Capital | Treasury Stock | Retained Earnings | Accumulated Other Comprehensive Income | Non-Controlling Interests
--- | --- | --- | --- | --- | --- | ---
Balance (in shares) at Jun. 30, 2017 |  | (264,060,000) | (1,102,000) |  |  |
Balance at Jun. 30, 2017 | $ 3,533,319 | $ 1,613,454 | $ (27,520) | $ 1,897,624 | $ 48,800 | $ 961
Issuance of Common Shares |  |  |  |  |  |
Under employee stock option plans (in shares) |  | 1,048,000 |  |  |  |
Under employee stock option plans | 16,154 | $ 16,154 |  |  |  |
Under employee stock purchase plans (in shares) |  | 180,000 |  |  |  |
Under employee stock purchase plans | 4,837 | $ 4,837 |  |  |  |
Share-based compensation | 8,235 | 8,235 |  |  |  |
Issuance of treasury stock | 0 | $ (178) | $ 178 |  |  |
Issuance of treasury stock (in shares) |  |  | 9,000 |  |  |
Dividends | (35,017) |  |  | (35,017) |  |
Other comprehensive income (loss) - net | 718 |  |  |  | 718 |
Net income for the year | 36,690 |  |  | 36,596 |  | 94
Balance (in shares) at Sep. 30, 2017 |  | (265,288,000) | (1,093,000) |  |  |
Balance at Sep. 30, 2017 | 3,564,936 | $ 1,642,502 | $ (27,342) | 1,899,203 | 49,518 | 1,055
Balance (in shares) at Jun. 30, 2017 |  | (264,060,000) | (1,102,000) |  |  |
Balance at Jun. 30, 2017 | $ 3,533,319 | $ 1,613,454 | $ (27,520) | 1,897,624 | 48,800 | 961
Issuance of Common Shares |  |  |  |  |  |
Purchase of treasury stock (in shares) | 0 |  |  |  |  |
Issuance of treasury stock (in shares) | 387,443 |  |  |  |  |
Other comprehensive income (loss) - net | $ (1,279) |  |  |  |  |
Net income for the year | 121,607 |  |  |  |  |
Balance (in shares) at Dec. 31, 2017 |  | (265,626,000) | (714,000) |  |  |
Balance at Dec. 31, 2017 | 3,628,852 | $ 1,650,217 | $ (19,250) | 1,949,503 | 47,521 | 861
Balance (in shares) at Sep. 30, 2017 |  | (265,288,000) | (1,093,000) |  |  |
Balance at Sep. 30, 2017 | 3,564,936 | $ 1,642,502 | $ (27,342) | 1,899,203 | 49,518 | 1,055
Issuance of Common Shares |  |  |  |  |  |
Under employee stock option plans (in shares) |  | 145,000 |  |  |  |
Under employee stock option plans | 3,374 | $ 3,374 |  |  |  |
Under employee stock purchase plans (in shares) |  | 193,000 |  |  |  |
Under employee stock purchase plans | 5,275 | $ 5,275 |  |  |  |
Share-based compensation | 7,158 | 7,158 |  |  |  |
Issuance of treasury stock | $ 0 | $ (8,092) | $ 8,092 |  |  |
Issuance of treasury stock (in shares) | 379,111 |  | 379,000 |  |  |
Dividends | $ (34,811) |  |  | (34,811) |  |
Other comprehensive income (loss) - net | (1,997) |  |  |  | (1,997) |
Net income for the year | 84,917 |  |  | 85,111 |  | (194)
Balance (in shares) at Dec. 31, 2017 |  | (265,626,000) | (714,000) |  |  |
Balance at Dec. 31, 2017 | 3,628,852 | $ 1,650,217 | $ (19,250) | 1,949,503 | 47,521 | 861
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Cumulative effect of new accounting principle | Accounting Standards Update 2016-16 | (26,780) |  |  | (26,780) |  |
Cumulative effect of new accounting principle | Accounting Standards Update 2014-09 | 29,786 |  |  | 29,786 |  |
Balance (in shares) at Jun. 30, 2018 |  | (267,651,000) | (691,000) |  |  |
Balance at Jun. 30, 2018 | 3,717,258 | $ 1,707,073 | $ (18,732) | 1,994,235 | 33,645 | 1,037
Issuance of Common Shares |  |  |  |  |  |
Under employee stock option plans (in shares) |  | 494,000 |  |  |  |
Under employee stock option plans | 12,431 | $ 12,431 |  |  |  |
Under employee stock purchase plans (in shares) |  | 187,000 |  |  |  |
Under employee stock purchase plans | 5,569 | $ 5,569 |  |  |  |
Share-based compensation | 6,555 | 6,555 |  |  |  |
Purchase of treasury stock (in shares) |  |  | (304,000) |  |  |
Purchase of treasury stock | (11,719) |  | $ (11,719) |  |  |
Issuance of treasury stock | 0 | (70) | $ 70 |  |  |
Issuance of treasury stock (in shares) |  |  | 3,000 |  |  |
Dividends | (40,466) |  |  | (40,466) |  |
Other comprehensive income (loss) - net | (1,389) |  |  |  | (1,389) |
Non-controlling interest | (583) | $ (625) |  |  |  | 42
Net income for the year | 36,368 |  |  | 36,324 |  | 44
Balance (in shares) at Sep. 30, 2018 |  | (268,332,000) | (992,000) |  |  |
Balance at Sep. 30, 2018 | 3,727,030 | $ 1,730,933 | $ (30,381) | 1,993,099 | 32,256 | 1,123
Balance (in shares) at Jun. 30, 2018 |  | (267,651,000) | (691,000) |  |  |
Balance at Jun. 30, 2018 | $ 3,717,258 | $ 1,707,073 | $ (18,732) | 1,994,235 | 33,645 | 1,037
Issuance of Common Shares |  |  |  |  |  |
Under employee stock option plans (in shares) | 555,952 |  |  |  |  |
Purchase of treasury stock (in shares) | (674,265) |  |  |  |  |
Issuance of treasury stock (in shares) | 547,897 |  |  |  |  |
Other comprehensive income (loss) - net | $ (7,674) |  |  |  |  |
Net income for the year | 140,829 |  |  |  |  |
Balance (in shares) at Dec. 31, 2018 |  | (268,569,000) | (817,000) |  |  |
Balance at Dec. 31, 2018 | 3,786,012 | $ 1,731,299 | $ (29,241) | 2,056,831 | 25,971 | 1,152
Balance (in shares) at Sep. 30, 2018 |  | (268,332,000) | (992,000) |  |  |
Balance at Sep. 30, 2018 | 3,727,030 | $ 1,730,933 | $ (30,381) | 1,993,099 | 32,256 | 1,123
Issuance of Common Shares |  |  |  |  |  |
Under employee stock option plans (in shares) |  | 62,000 |  |  |  |
Under employee stock option plans | 1,740 | $ 1,740 |  |  |  |
Under employee stock purchase plans (in shares) |  | 175,000 |  |  |  |
Under employee stock purchase plans | 5,696 | $ 5,696 |  |  |  |
Share-based compensation | $ 6,885 | 6,885 |  |  |  |
Purchase of treasury stock (in shares) | (370,265) |  | (370,000) |  |  |
Purchase of treasury stock | $ (12,815) |  | $ (12,815) |  |  |
Issuance of treasury stock | $ 0 | $ (13,955) | $ 13,955 |  |  |
Issuance of treasury stock (in shares) | 544,929 |  | 545,000 |  |  |
Dividends | $ (40,700) |  |  | (40,700) |  |
Other comprehensive income (loss) - net | (6,285) |  |  |  | (6,285) |
Non-controlling interest | 0 |  |  |  |  |
Net income for the year | 104,461 |  |  | 104,432 |  | 29
Balance (in shares) at Dec. 31, 2018 |  | (268,569,000) | (817,000) |  |  |
Balance at Dec. 31, 2018 | $ 3,786,012 | $ 1,731,299 | $ (29,241) | $ 2,056,831 | $ 25,971 | $ 1,152

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