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SHAREHOLDERS' EQUITY (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Jun. 30, 2019 | Mar. 31, 2019 | Jun. 30, 2018 | Mar. 31, 2018 | Jun. 30, 2019 | Jun. 30, 2018 | Feb. 20, 2019 | Feb. 21, 2018 | May 31, 2017
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |  |  |  |  |  |
Annual interest rate on convertible senior notes |  |  |  |  |  |  |  |  | 0.625%
Calculation of weighted average common shares |  |  |  |  |  |  |  |  |
Weighted average common shares, basic | 12,805,000 |  | 12,416,000 |  | 12,762,000 | 12,254,000 |  |  |
Effect of dilutive securities |  |  |  |  |  |  |  |  |
Effect of stock options (in shares) | 810,000 |  | 1,176,000 |  | 777,000 | 1,363,000 |  |  |
Effect of dilutive share awards (in shares) | 194,000 |  | 135,000 |  | 191,000 | 177,000 |  |  |
Effect of Convertible Senior Notes (in shares) | 1,099,000 |  | 420,000 |  | 892,000 | 733,000 |  |  |
Weighted average common shares, diluted | 14,908,000 |  | 14,147,000 |  | 14,622,000 | 14,527,000 |  |  |
Common stock repurchases |  |  |  |  |  |  |  |  |
Value of common stock authorized to be repurchased |  |  |  |  |  |  | $ 150,000 | $ 100,000 |
Purchase of treasury stock (in shares) |  |  |  |  | 17,501 | 156,731 |  |  |
Treasury Stock, Value, Acquired, Cost Method |  | $ 3,976 | $ 35,003 | $ 11,000 | $ 4,000 | $ 46,000 |  |  |
Remaining authorized repurchase amount | $ 181,200 |  |  |  | $ 181,200 |  |  |  |
Employee stock options |  |  |  |  |  |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |  |  |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount | 100,000 |  | 400,000 |  |  |  |  |  |

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