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STOCK-BASED COMPENSATION (Details) | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2018 USD ($) $ / shares shares | Jun. 30, 2017 USD ($) | Jun. 30, 2018 USD ($) Integer $ / shares shares | Jun. 30, 2017 USD ($)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Allocated Share-based Compensation Expense | $ |  |  |  | $ (2,929,000) |
Equity Incentive Plan 2013 [Member] | Restricted Stock [Member] | Service Condition Only Awards [Member] | Non Executive Officers [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Grant date fair value of shares issued (in dollars per share) | $ / shares |  |  |  | $ 95.17 |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward] |  |  |  |  |
Granted (in shares) |  |  |  | 12,425 |
Weighted Average Grant Date Fair Value [Abstract] |  |  |  |  |
Granted (per share) | $ / shares |  |  |  | $ 95.17 |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage |  |  |  | 20.00% |
Award Recipient Type Employee [Member] | Restricted Stock [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Stock-based compensation costs capitalized as development costs | $ |  | $ 245,000 | $ 383,000 | $ 459,000 | $ 869,000
Allocated Share-based Compensation Expense | $ |  | $ 1,108,000 | 952,000 | $ 2,151,000 | 3,633,000
Shares withheld for tax obligations |  |  |  | 23,824 |
Fair value of shares vested as of the vesting date | $ |  |  |  | $ 5,142,000 |
Weighted Average Grant Date Fair Value [Abstract] |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other Than Options, Potential Grants in Future Period (minimum) |  |  |  | 0 |
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other Than Options, Potential Grants in Future Period (maximum) |  |  |  | 86,836 |
Award Recipient Type Employees and Directors [Member] | Restricted Stock [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Grant date fair value of shares issued (in dollars per share) | $ / shares | [1],[2] | $ 95.18 |  | $ 84.09 |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward] |  |  |  |  |
Unvested at beginning of period (in shares) |  | 123,287 |  | 152,926 |
Granted (in shares) | [1],[2] | 20,309 |  | 50,217 |
Forfeited (in shares) |  | 0 |  | 0 |
Vested (in shares) |  | 0 |  | (59,547) |
Unvested at end of period (in shares) |  | 143,596 |  | 143,596 |
Weighted Average Grant Date Fair Value [Abstract] |  |  |  |  |
Unvested at beginning of period (per share) | $ / shares |  | $ 66.20 |  | $ 63.22 |
Granted (per share) | $ / shares | [1],[2] | 95.18 |  | 84.09 |
Forfeited (per share) | $ / shares |  | 0.00 |  | 0.00 |
Vested (per share) | $ / shares |  | 0.00 |  | 63.77 |
Unvested at end of period (per share) | $ / shares |  | $ 70.30 |  | $ 70.30 |
Award Recipient Type Director [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Allocated Share-based Compensation Expense | $ |  | $ 776,000 | $ 161,000 | $ 1,131,000 | $ 323,000
2017 Award [Member] | Equity Incentive Plan 2013 [Member] | Restricted Stock [Member] | Shareholder Return Awards [Member] | Executive Officer [Member] |  |  |  |  |
Weighted Average Grant Date Fair Value [Abstract] |  |  |  |  |
Equity Instruments other than options, number of plans | Integer |  |  |  | 3 |
2017 Award [Member] | Equity Incentive Plan 2013 [Member] | Restricted Stock [Member] | Service Condition Only Awards [Member] | Executive Officer [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Grant date fair value of shares issued (in dollars per share) | $ / shares |  |  |  | $ 78.18 |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward] |  |  |  |  |
Granted (in shares) |  |  |  | 5,406 |
Weighted Average Grant Date Fair Value [Abstract] |  |  |  |  |
Granted (per share) | $ / shares |  |  |  | $ 78.18 |
Equity Instruments other than options, number of plans | Integer |  |  |  | 1 |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage |  |  |  | 25.00% |
Share Based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vesting Rights (% vesting per year in future years) |  |  |  | 25.00% |
2017 Award [Member] | Award Recipient Type Employee [Member] | Equity Incentive Plan 2013 [Member] | Restricted Stock [Member] | Company Performance Awards [Member] | Executive Officer [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Grant date fair value of shares issued (in dollars per share) | $ / shares |  |  |  | $ 78.18 |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward] |  |  |  |  |
Granted (in shares) |  |  |  | 21,097 |
Weighted Average Grant Date Fair Value [Abstract] |  |  |  |  |
Granted (per share) | $ / shares |  |  |  | $ 78.18 |
Share Based Compensation Arrangement by Share Based Payment Award, Equity Instruments Other Than Options, Percent of vesting that occurred on grant date |  |  |  | 20.00% |
Share Based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vesting Rights (% vesting per year in future years) |  |  |  | 20.00% |
2017 Award [Member] | Award Recipient Type Employee [Member] | Equity Incentive Plan 2013 [Member] | Restricted Stock [Member] | Individual performance awards [Member] | Executive Officer [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Grant date fair value of shares issued (in dollars per share) | $ / shares |  |  |  | $ 80.93 |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward] |  |  |  |  |
Granted (in shares) |  |  |  | 4,554 |
Weighted Average Grant Date Fair Value [Abstract] |  |  |  |  |
Granted (per share) | $ / shares |  |  |  | $ 80.93 |
Share Based Compensation Arrangement by Share Based Payment Award, Equity Instruments Other Than Options, Percent of vesting that occurred on grant date |  |  |  | 20.00% |
Share Based Compensation Arrangement By Share Based Payment Award Possible Shares To Be Awarded Vesting Rights |  |  |  | 20.00% |
2017 Award [Member] | One year period [Member] | Equity Incentive Plan 2013 [Member] | Restricted Stock [Member] | Shareholder Return Awards [Member] | Executive Officer [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward] |  |  |  |  |
Granted (in shares) |  |  |  | 4,257 |
Weighted Average Grant Date Fair Value [Abstract] |  |  |  |  |
Share Based Compensation Arrangement by Share Based Payment Award, Equity Instruments Other Than Options, Percent of vesting that occurred on grant date |  |  |  | 100.00% |
Number of years in total shareholder return performance period | Integer |  |  |  | 1 |
2017 Award [Member] | Two year period [Member] | Equity Incentive Plan 2013 [Member] | Restricted Stock [Member] | Shareholder Return Awards [Member] | Executive Officer [Member] |  |  |  |  |
Weighted Average Grant Date Fair Value [Abstract] |  |  |  |  |
Share Based Compensation Arrangement by Share Based Payment Award, Equity Instruments Other Than Options, Percent of future vesting that will occur on performance determination date |  |  |  | 100.00% |
Number of years in total shareholder return performance period | Integer |  |  |  | 2 |
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other Than Options, Potential Grants in Future Period (minimum) |  |  |  | 0 |
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other Than Options, Potential Grants in Future Period (maximum) |  |  |  | 9,460 |
2017 Award [Member] | Three year period [Member] | Equity Incentive Plan 2013 [Member] | Restricted Stock [Member] | Shareholder Return Awards [Member] | Executive Officer [Member] |  |  |  |  |
Weighted Average Grant Date Fair Value [Abstract] |  |  |  |  |
Share Based Compensation Arrangement by Share Based Payment Award, Equity Instruments Other Than Options, Percent of future vesting that will occur on performance determination date |  |  |  | 75.00% |
Share Based Compensation Arrangement By Share Based Payment Award Possible Shares To Be Awarded Vesting Rights |  |  |  | 25.00% |
Number of years in total shareholder return performance period | Integer |  |  |  | 3 |
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other Than Options, Potential Grants in Future Period (minimum) |  |  |  | 0 |
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other Than Options, Potential Grants in Future Period (maximum) |  |  |  | 18,917 |
2018 Award [Member] | Equity Incentive Plan 2013 [Member] | Restricted Stock [Member] | Shareholder Return Awards [Member] | Executive Officer [Member] |  |  |  |  |
Weighted Average Grant Date Fair Value [Abstract] |  |  |  |  |
Equity Instruments other than options, number of plans | Integer |  |  |  | 1 |
2018 Award [Member] | Equity Incentive Plan 2013 [Member] | Restricted Stock [Member] | Service Condition Only Awards [Member] | Executive Officer [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Grant date fair value of shares issued (in dollars per share) | $ / shares |  |  |  | $ 95.19 |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward] |  |  |  |  |
Granted (in shares) |  |  |  | 7,884 |
Weighted Average Grant Date Fair Value [Abstract] |  |  |  |  |
Granted (per share) | $ / shares |  |  |  | $ 95.19 |
Equity Instruments other than options, number of plans | Integer |  |  |  | 1 |
Share Based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vesting Rights (% vesting per year in future years) |  |  |  | 25.00% |
2018 Award [Member] | Award Recipient Type Employee [Member] | Equity Incentive Plan 2013 [Member] | Restricted Stock [Member] | Company Performance Awards [Member] | Executive Officer [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Grant date fair value of shares issued (in dollars per share) | $ / shares |  |  |  | $ 95.19 |
Weighted Average Grant Date Fair Value [Abstract] |  |  |  |  |
Granted (per share) | $ / shares |  |  |  | $ 95.19 |
Share Based Compensation Arrangement by Share Based Payment Award, Equity Instruments Other Than Options, Percent of future vesting that will occur on performance determination date |  |  |  | 20.00% |
Share Based Compensation Arrangement By Share Based Payment Award Possible Shares To Be Awarded Vesting Rights |  |  |  | 20.00% |
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other Than Options, Potential Grants in Future Period (minimum) |  |  |  | 0 |
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other Than Options, Potential Grants in Future Period (maximum) |  |  |  | 24,690 |
2018 Award [Member] | Award Recipient Type Employee [Member] | Equity Incentive Plan 2013 [Member] | Restricted Stock [Member] | Individual performance awards [Member] | Executive Officer [Member] |  |  |  |  |
Weighted Average Grant Date Fair Value [Abstract] |  |  |  |  |
Share Based Compensation Arrangement by Share Based Payment Award, Equity Instruments Other Than Options, Percent of future vesting that will occur on performance determination date |  |  |  | 20.00% |
Share Based Compensation Arrangement By Share Based Payment Award Possible Shares To Be Awarded Vesting Rights |  |  |  | 20.00% |
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other Than Options, Potential Grants in Future Period (minimum) |  |  |  | 0 |
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other Than Options, Potential Grants in Future Period (maximum) |  |  |  | 6,173 |
2018 Award [Member] | Three year period [Member] | Equity Incentive Plan 2013 [Member] | Restricted Stock [Member] | Shareholder Return Awards [Member] | Executive Officer [Member] |  |  |  |  |
Weighted Average Grant Date Fair Value [Abstract] |  |  |  |  |
Share Based Compensation Arrangement by Share Based Payment Award, Equity Instruments Other Than Options, Percent of future vesting that will occur on performance determination date |  |  |  | 75.00% |
Share Based Compensation Arrangement By Share Based Payment Award Possible Shares To Be Awarded Vesting Rights |  |  |  | 25.00% |
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other Than Options, Potential Grants in Future Period (minimum) |  |  |  | 0 |
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other Than Options, Potential Grants in Future Period (maximum) |  |  |  | 27,596 |
[1] | (1) Includes shares granted in prior years for which performance conditions have been satisfied and the number of shares have been determined.
[2] | Does not include the restricted shares that may be earned if the performance goals established in 2017 for long-term performance and in 2018 for annual and long-term performance are achieved. Depending on the actual level of achievement of the goals at the end of the open performance periods, the number of shares earned could range from zero to 86,836.

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- Definition The minimum number of shares to be granted in a future period on other than stock option plans. + References No definition available. + Details
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- Definition For possible share-based compensation plans to be awarded in the future, a description of the award terms as to how many shares or portion of an award will be no longer contingent on satisfaction of either a service condition, market condition or a performance condition, thereby giving the employee the legal right to convert the award to shares, to sell the shares, and be entitled to the cash proceeds of such sale. + References No definition available. + Details
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- Definition Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees. + 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.F) -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 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5047-113901 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition Represents the compensation cost capitalized during the period arising from equity-based compensation arrangements (for example, shares of stock, units, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees. + 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 (h)(1)(ii) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition Weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were not exercised or put into effect as a result of the occurrence of a terminating event. + 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)(3) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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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=96867065&loc=d3e5070-113901 + Details
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- Definition The weighted average fair value at grant date for nonvested equity-based awards issued 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=96867065&loc=d3e5070-113901 + Details
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- Definition The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date. + 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=96867065&loc=d3e5070-113901 + Details
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- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. + References No definition available. + 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=96867065&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=96867065&loc=d3e5070-113901 + Details
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- Definition The weighted average fair value as of grant date pertaining to an equity-based award plan other than a stock (or unit) option plan for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the arrangement. + 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=96867065&loc=d3e5070-113901 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition Number of shares under non-option equity instrument agreements that were cancelled as a result of occurrence of a terminating event. + 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=96867065&loc=d3e5070-113901 + Details
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- Definition Percentage of vesting of share-based compensation awards. + 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=96867065&loc=d3e5070-113901 + Details
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- Definition For net-share settlement of share-based awards when the employer settles employees' income tax withholding obligations, this element represents the number of shares the employees use to repay the employer. + References No definition available. + Details
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