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STATEMENTS OF SHAREHOLDERS' EQUITY - USD ($)
$ in Thousands
Ordinary Shares [Member]
Additional paid-in capital [Member]
Accumulated other comprehensive income (loss) [Member]
Retained Earnings [Member]
Total
Balance at Dec. 31, 2016 $ 88 $ 221,609 $ (175) $ 74,694 $ 296,216
Balance, shares at Dec. 31, 2016 34,250,590        
Cumulative effect adjustment resulting from adoption of new accounting pronouncements   376   13,184 13,560
Exercise of options and vested RSUs granted to employees $ 3 2,621     2,624
Exercise of options and vested RSUs granted to employees, shares 1,024,298        
Other comprehensive income (loss), net of tax     282   282
Share-based compensation   25,268     25,268
Net income       16,015 16,015
Balance at Dec. 31, 2017 $ 91 249,874 107 103,893 353,965
Balance, shares at Dec. 31, 2017 35,274,888        
Cumulative effect adjustment resulting from adoption of new accounting pronouncements       12,749 12,749
Exercise of options and vested RSUs granted to employees $ 4 18,035     18,039
Exercise of options and vested RSUs granted to employees, shares 1,563,635        
Other comprehensive income (loss), net of tax     (1,046)   (1,046)
Share-based compensation   35,991     35,991
Net income       47,072 47,072
Balance at Dec. 31, 2018 $ 95 303,900 (939) 163,714 466,770
Balance, shares at Dec. 31, 2018 36,838,523        
Exercise of options and vested RSUs granted to employees $ 4 24,543     24,547
Exercise of options and vested RSUs granted to employees, shares 1,204,993        
Equity component of convertible senior notes, net of tax   65,932     65,932
Purchase of capped calls   (53,648)     (53,648)
Other comprehensive income (loss), net of tax     1,757   1,757
Share-based compensation   55,710     55,710
Net income       63,064 63,064
Balance at Dec. 31, 2019 $ 99 $ 396,437 $ 818 $ 226,778 $ 624,132
Balance, shares at Dec. 31, 2019 38,043,516