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STOCK-BASED COMPENSATION (Details - Stock Options Rollforward) - USD ($) |  |  |  |  | 12 Months Ended
--- | --- | --- | --- | --- | ---
Jul. 27, 2016 | Aug. 15, 2015 | May 27, 2015 | Aug. 06, 2014 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Aggregate Intrinsic Value |  |  |  |  |  |  |
Share price |  |  |  |  | $ 101.35 |  |
Weighted average fair value (in dollars per share) |  |  |  |  | $ 40.05 | $ 27.60 | $ 11.22
Weighted average assumptions |  |  |  |  |  |  |
Fair Value of Options Vested |  |  |  |  | $ 900,000 | $ 800,000 | $ 400,000
Employee Stock Option [Member] |  |  |  |  |  |  |
Weighted Average Remaining Contractual Term |  |  |  |  |  |  |
Outstanding at the end of the period |  |  |  |  | 5 years 1 month 28 days |  |
Options exercisable at the end of the period |  |  |  |  | 2 years 7 months 18 days |  |
Aggregate Intrinsic Value |  |  |  |  |  |  |
Outstanding at the end of the period |  |  |  |  | $ 159,754,000 |  |
Options exercisable at the end of the period |  |  |  |  | 88,977,000 |  |
Intrinsic value of stock options exercised |  |  |  |  | 300,000 | $ 5,900,000 | $ 200,000
Cash received from stock option exercised |  |  |  |  | 200,000 |  |
Actual tax benefit realized |  |  |  |  | $ 100,000 |  |
Vesting period |  |  |  |  | 3 years |  |
Consultant Stock Option [Member] |  |  |  |  |  |  |
Aggregate Intrinsic Value |  |  |  |  |  |  |
Vesting period |  |  |  |  |  | 6 months |
Employee Stock Option 2 [Member] |  |  |  |  |  |  |
Aggregate Intrinsic Value |  |  |  |  |  |  |
Vesting period |  | 1 year |  |  |  |  |
Stock Options |  |  |  |  |  |  |
Number of Options |  |  |  |  |  |  |
Outstanding at the beginning of the period (in shares) |  |  |  |  | 1,918,182 |  |
Granted (in shares) |  |  |  |  | 86,149 |  |
Exercised (in shares) |  |  |  |  | (6,093) |  |
Forfeited (in shares) |  |  |  |  | (6,329) |  |
Expired (in shares) |  |  |  |  | (107) |  |
Outstanding at the end of the period (in shares) |  |  |  |  | 1,991,802 | 1,918,182 |
Options exercisable at the end of the period (in shares) |  |  |  |  | 970,202 |  |
Weighted Average Exercise Price |  |  |  |  |  |  |
Outstanding at the beginning of the period (in dollars per share) |  |  |  |  | $ 18.85 |  |
Granted (in dollars per share) |  |  |  |  | 79.46 |  |
Exercised (in dollars per share) |  |  |  |  | 38.58 |  |
Forfeited (in dollars per share) |  |  |  |  | 74.48 |  |
Expired (in dollars per share) |  |  |  |  | 117.95 |  |
Outstanding at the end of the period (in dollars per share) |  |  |  |  | 21.23 | $ 18.85 |
Options exercisable at the end of the period (in dollars per share) |  |  |  |  | $ 9.69 |  |
Weighted average assumptions |  |  |  |  |  |  |
Expected Volatility Rate, Minimum |  |  |  |  | 48.00% | 38.00% | 36.00%
Expected Volatility Rate, Maximum |  |  |  |  | 53.00% | 48.00% | 64.00%
Risk Free Interest Rate, Minimum |  |  |  |  | 1.10% | 1.65% | 1.81%
Risk Free Interest Rate, Maximum |  |  |  |  | 2.18% | 2.01% | 2.13%
Dividend yield (as a percent) |  |  |  |  | 0.00% | 0.00% | 0.00%
Expected dividend payment |  |  |  |  | $ 0 |  |
Director Stock Options |  |  |  |  |  |  |
Aggregate Intrinsic Value |  |  |  |  |  |  |
Vesting period | 5 months |  |  |  | 2 years |  |
Minimum [Member] | Stock Options |  |  |  |  |  |  |
Weighted average assumptions |  |  |  |  |  |  |
Expected Term, Simplified Method |  |  |  |  | P5Y2M20D | P5Y2M15D | P5Y9M
Maximum [Member] | Stock Options |  |  |  |  |  |  |
Weighted average assumptions |  |  |  |  |  |  |
Expected Term, Simplified Method |  |  |  |  | P6Y4M18D | P6Y2M22D | P6Y7M17D
Tranche 1 | Employee Stock Option [Member] |  |  |  |  |  |  |
Aggregate Intrinsic Value |  |  |  |  |  |  |
Vesting period |  |  | 1 year 8 months 2 days | 2 years 6 months | 2 years |  |
Award Vesting Rights, Percentage |  |  | 25.00% | 25.00% |  |  |
Tranche 2 | Employee Stock Option [Member] |  |  |  |  |  |  |
Aggregate Intrinsic Value |  |  |  |  |  |  |
Vesting period |  |  | 2 years 8 months 2 days | 3 years 6 months | 3 years |  |
Award Vesting Rights, Percentage |  |  | 75.00% | 75.00% |  |  |

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- Definition Amount of deferred tax expense from write-off of the deferred tax asset related to deductible stock options at exercise. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 20 -Section 55 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=65896087&loc=d3e11283-113907 + Details
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- Definition The cash inflow associated with the amount received from holders exercising their stock options. This item inherently excludes any excess tax benefit, which the entity may have realized and reported separately. + 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 (j) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3255-108585 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 + Details
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- Definition Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + 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 (a)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The estimated amount of dividends to be paid to holders of the underlying shares (expected dividends) over the option's term. Dividends are taken into account because payment of dividends to shareholders reduces the fair value of the underlying shares, and option holders generally do not receive dividends. + 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 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 Discloses use of the simplified method to calculate the expected term that stock option awards under the specified plan will exist before being exercised or terminated, the reason and justification for its use, and the periods for which the method was used if it was not used in all periods presented. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 14.D.2.Q6) -URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2)(i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The estimated measure of the maximum 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 No definition available. + Details
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- Definition The estimated measure of the minimum 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 No definition available. + Details
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- Definition The maximum risk-free interest rate assumption that is used in valuing an option on its own shares. + References No definition available. + Details
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- Definition The minimum risk-free interest rate assumption that is used in valuing an option on its own shares. + References No definition available. + Details
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- Definition The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the 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 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 of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into 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 (d)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Number of options or other stock instruments for which the right to exercise has lapsed under the terms of the plan agreements. + 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)(iv)(4) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to 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)(iv)(3) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Net number of share options (or share units) granted during 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 (c)(1)(iv)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology. + 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 (d)(1) -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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- Definition Number of options outstanding, including both vested and non-vested options. + 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 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Weighted average price at which grantees can acquire the shares reserved for issuance 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)(i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Amount of difference between fair value of the underlying shares reserved for issuance and exercise price of vested portions of options outstanding and currently exercisable. + 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 Weighted average remaining contractual term for option awards outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + 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 (e)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Fair value of options vested. Excludes equity instruments other than options, for example, but not limited to, share units, stock appreciation rights, restricted stock. + 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) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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