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STOCKHOLDERS' EQUITY (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2015 | Jun. 30, 2014 | Jun. 30, 2015 | Jun. 30, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Shares available for future awards (in shares) | 3,772,007 |  | 3,772,007 |
Weighted average grant date fair value [Abstract] |  |  |  |
Unrecognized compensation cost related to non-vested shares | $ 12,146 | $ 7,158 | $ 12,146 | $ 7,158
Weighted-average period of recognition for unrecognized compensation cost |  |  | 2 years |
Estimated share-based compensation expense for current fiscal year | $ 5,700 |  | $ 5,700 |
Stock splits and repurchase of common stock |  |  |  |
Number of shares authorized to be repurchased (in shares) | 3,763,038 |  | 3,763,038 |
Number of shares acquired under the stock repurchase plan (in shares) |  |  | 2,105,601 |
Number of shares acquired under stock repurchase plan and subsequently reissued (in shares) |  |  | 370 |
Treasury stock acquired, average cost (in dollars per share) |  |  | $ 56.85 |
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |  |  |
Impact of compensation cost on net earnings | $ (982) | $ (847) | $ (1,743) | $ (1,499)
Stock Options [Member] |  |  |  |
Weighted Average Assumptions [Abstract] |  |  |  |
Dividend yield (in hundredths) |  |  | 0.60% | 0.50%
Expected volatility (in hundredths) |  |  | 33.00% | 34.00%
Risk-free interest rate (in hundredths) |  |  | 1.70% | 1.80%
Expected term |  |  | 5 years 6 months | 5 years 7 months 6 days
Vesting period | 3 years |  |  |
Stock Option Activity [Abstract] |  |  |  |
Outstanding at beginning of period (in shares) |  |  | 1,470,000 | 1,893,000
Granted (in shares) |  |  | 207,000 | 268,000
Exercised (in shares) |  |  | (519,000) | (249,000)
Forfeited (in shares) |  |  | (12,000) | (126,000)
Outstanding at end of period (in shares) | 1,146,000 | 1,786,000 | 1,146,000 | 1,786,000
Exercisable at end of period (in shares) | 718,000 | 1,425,000 | 718,000 | 1,425,000
Weighted Average Exercise Price [Abstract] |  |  |  |
Outstanding at beginning of period (in dollars per share) |  |  | $ 27.35 | $ 20.94
Granted (in dollars per share) |  |  | 58.34 | 53.80
Exercised (in dollars per share) |  |  | 19.12 | 11.56
Forfeited (in dollars per share) |  |  | 50.46 | 56.03
Outstanding at end of period (in dollars per share) | $ 36.45 | $ 24.71 | 36.45 | 24.71
Exercisable, end of period (in dollars per share) | $ 26.77 | $ 20.40 | $ 26.77 | $ 20.40
Aggregate Intrinsic Value, Outstanding, beginning of period |  |  | $ 57,742 | $ 71,465
Aggregate Intrinsic Value, Outstanding, end of period | $ 22,660 | $ 51,517 | 22,660 | 51,517
Aggregate Intrinsic Value, Exercisable, end of period | $ 20,785 | $ 47,250 | $ 20,785 | $ 47,250
Weighted Average Remaining Contractual Term, Outstanding |  |  | 6 years 7 months 6 days | 5 years 3 months 18 days
Weighted Average Remaining Contractual Term, Exercisable |  |  | 5 years 2 months 12 days | 4 years 4 months 24 days
Weighted-average fair value of options granted (in dollars per share) | $ 17.07 | $ 19.68 | $ 18.35 | $ 17.53
Total intrinsic value of stock options exercised | $ 12,244 | $ 5,526 | $ 20,284 | $ 10,944
Restricted Stock [Member] |  |  |  |
Non-vested restricted stock [Roll Forward] |  |  |  |
Non-vested balance as of beginning of period (in shares) |  |  | 134,000 | 172,000
Granted (in shares) |  |  | 76,000 | 25,000
Vested (in shares) |  |  | (11,000) | (24,000)
Forfeited (in shares) |  |  | 0 | (6,000)
Non-vested balance as of end of period (in shares) | 199,000 | 167,000 | 199,000 | 167,000
Weighted average grant date fair value [Abstract] |  |  |  |
Non-vested balance as of beginning of period (in dollars per share) |  |  | $ 38.13 | $ 33.69
Granted (in dollars per share) |  |  | 55.77 | 51.03
Vested (in dollars per share) |  |  | 16.69 | 37.61
Forfeited (in dollars per share) |  |  | 0 | 45.32
Non-vested balance as of end of period (in dollars per share) | $ 46.11 | $ 35.27 | $ 46.11 | $ 35.27
Restricted Stock [Member] | Employee [Member] |  |  |  |
Weighted Average Assumptions [Abstract] |  |  |  |
Vesting period | 4 years |  |  |
Restricted Stock [Member] | Non-employee Director [Member] |  |  |  |
Weighted Average Assumptions [Abstract] |  |  |  |
Vesting period | 4 years |  |  |
Performance Shares [Member] |  |  |  |
Non-vested restricted stock [Roll Forward] |  |  |  |
Non-vested balance as of beginning of period (in shares) |  |  | 0 | 0
Granted (in shares) |  |  | 29,000 | 0
Vested (in shares) |  |  | 0 | 0
Forfeited (in shares) |  |  | 9,000 | 0
Non-vested balance as of end of period (in shares) | 20,000 | 0 | 20,000 | 0
Weighted average grant date fair value [Abstract] |  |  |  |
Non-vested balance as of beginning of period (in dollars per share) |  |  | $ 0 | $ 0
Granted (in dollars per share) |  |  | 58.77 | 0
Vested (in dollars per share) |  |  | 0 | 0
Forfeited (in dollars per share) |  |  | 58.77 | 0
Non-vested balance as of end of period (in dollars per share) | $ 58.77 | $ 0 | $ 58.77 | $ 0
Performance Shares [Member] | Employee [Member] |  |  |  |
Weighted Average Assumptions [Abstract] |  |  |  |
Dividend yield (in hundredths) |  |  | 0.50% |
Expected volatility (in hundredths) |  |  | 34.00% |
Risk-free interest rate (in hundredths) |  |  | 1.00% |
Vesting period | 3 years |  |  |
Weighted average grant date fair value [Abstract] |  |  |  |
Initial TSR (in hundredths) |  |  | (6.90%) |
Cliff vest (in hundredths) |  |  | 100.00% |
ISO Plan [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Expiration period of options granted | 10 years |  |  |
Non-Qualified Plan [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Expiration period of options granted | 10 years |  |  |
Cost of Sales [Member] |  |  |  |
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |  |  |
Impact of compensation cost on earnings component | $ 214 | $ 163 | $ 426 | $ 311
Operating Expenses [Member] |  |  |  |
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |  |  |
Impact of compensation cost on earnings component | $ 1,298 | $ 1,196 | $ 2,260 | $ 2,036

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- Definition The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The weighted average fair value of nonvested awards on equity-based plans excluding option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, revenue or profit achievement stock award plan) for which the employer is contingently obligated to issue equity instruments or transfer assets to an employee who has not yet satisfied service or performance criteria necessary to gain title to proceeds from the sale of the award or underlying shares or units. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2)(iii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The estimated measure of the percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2)(ii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The risk-free interest rate assumption that is used in valuing an option on its own shares. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2)(iv) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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