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STATEMENTS OF CHANGES IN SHAREHOLDERS' EQUITY - USD ($)
$ in Thousands
Share capital [Member]
Additional paid-in capital [Member]
Treasury shares [Member]
Accumulated other comprehensive loss [Member]
Retained earnings [Member]
Total
Balance at Dec. 31, 2014 $ 17,615 $ 1,171,424 $ (376,637) $ (10,546) $ 411,600 $ 1,213,456
Exercise of share options 362 26,736 27,098
Stock-based compensation 28,451 28,451
Excess tax benefit from share-based payment arrangements 7,595 7,595
Treasury shares purchased (68,384) (68,384)
Other comprehensive loss (13,659)   (13,659)
Dividends paid (38,239) (38,239)
Net income 258,831 258,831
Balance at Dec. 31, 2015 17,977 1,234,206 (445,021) (24,205) 632,192 1,415,149
Exercise of share options 303 23,321 23,624
Equity awards assumed for acquisitions 11,675 11,675
Stock-based compensation 40,547 40,547
Excess tax benefit from share-based payment arrangements 7,868 7,868
Issuance of treasury shares under stock purchase plans, upon exercise of options and vesting of restricted stock units (147,347 ordinary shares) (78) 78
Treasury shares purchased (43,630) (43,630)
Other comprehensive loss (22,619) (22,619)
Dividends paid (38,202) (38,202)
Net income 116,920 116,920
Balance at Dec. 31, 2016 18,280 1,317,539 (488,573) (46,824) 710,910 1,511,332
Exercise of share options 315 17,133 17,448
Equity awards assumed for acquisitions           20,281
Stock-based compensation 56,980 56,980
Issuance of treasury shares under stock purchase plans, upon exercise of options and vesting of restricted stock units (147,347 ordinary shares) (3,642) 5,296 1,654
Equity components of exchangeable notes 30,895 30,895
Treasury shares purchased (24,428) (24,428)
Other comprehensive loss 13,910 13,910
Dividends paid (9,637) (9,637)
Effect of adopting ASU 2016-09: Improvements to Employee Share-Based Payment Accounting (see note 2aa)   1,908     6,208 8,116
Net income 143,291 143,291
Balance at Dec. 31, 2017 $ 18,595 $ 1,420,813 $ (507,705) $ (32,914) $ 850,772 $ 1,749,561