Annual Director Retainer Stock Award Amount

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- Definition

Equity Instruments other than options, number of plans

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No definition available.

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- Definition

The vesting-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology.

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No definition available.

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- Definition

New Director Restricted Stock Award Amount to be Awarded in Future Periods

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No definition available.

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- Definition

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Number of years in total shareholder return performance period

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No definition available.

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- Definition

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- Definition

The total fair value of equity-based awards which were granted in the period in accordance with the terms of the arrangement.

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No definition available.

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- Definition

The percentage of shares to be awarded in the future that will vest on the grant date.

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No definition available.

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- Definition

The maximum number of shares to be granted in a future period on other than stock option plans.

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No definition available.

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The minimum number of shares to be granted in a future period on other than stock option plans.

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No definition available.

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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.

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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 that will vest within four to five years (less than five years but greater than four years from the balance sheet date.)

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No definition available.

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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 that will vest within one to two years (less than two years but greater than one year from the balance sheet date.)

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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 that will vest within three to four years (less than four years but greater than three years from the balance sheet date.)

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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 that will vest within two to three years (less than three years but greater than two years from the balance sheet date.)

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Share Based Compensation Arrangement by Share Based Payment Award, Equity Instruments Other Than Options, Percent of vesting that occurred on grant date

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Share Based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vesting Rights (% vesting per year in future years)

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Share based compensation, share based payment arrangements other than stock options, unrecognized cost associated with awards not yet vested

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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.

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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.

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Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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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.

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No definition available.

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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.

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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).

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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).

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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.

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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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No definition available.

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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.

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The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period.

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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.

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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.

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No definition available.

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Number of shares under non-option equity instrument agreements that were cancelled as a result of occurrence of a terminating event.

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The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested).

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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.

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Number of share instruments newly issued under a share-based compensation plan.

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Percentage of vesting of share-based compensation awards.

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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.

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STOCK-BASED COMPENSATION (Details)	3 Months Ended	12 Months Ended
STOCK-BASED COMPENSATION (Details)	Sep. 30, 2017 $ / shares shares	Dec. 31, 2018 USD ($) Integer $ / shares shares	Dec. 31, 2017 USD ($) $ / shares shares	Dec. 31, 2016 USD ($) $ / shares shares	Dec. 31, 2013 $ / shares shares	Dec. 31, 2018 USD ($) shares	Dec. 31, 2017 shares	Dec. 31, 2016 shares
Stock Compensation Plan disclosure [Abstract]
Stock-based compensation cost \| $		$ 6,103,000	$ 7,012,000	$ 5,831,000
Award Recipient Type Employee [Member] \| Restricted Stock [Member]
Stock Compensation Plan disclosure [Abstract]
Stock-based compensation cost \| $		5,322,000	6,309,000	5,184,000
Stock based compensation cost capitalized as development costs \| $		$ 1,173,000	$ 1,458,000	$ 1,183,000
Share awards granted (in shares)		50,217	93,285	80,529
Grant date fair value of shares issued (in dollars per share) \| $ / shares		$ 84.09	$ 76.70	$ 58.81
Compensation is recognized over a weighted average period (in years)		2 years 6 months 11 days
Share based compensation, share based payment arrangements other than stock options, unrecognized cost associated with awards not yet vested \| $		$ 5,785,000
Shares withheld to satisfy the tax obligations (in shares)		23,824	33,695	57,316
Fair value of shares granted \| $		$ 4,223,000	$ 7,155,000	$ 4,736,000
Fair value of shares vested as of the vesting date \| $		$ 5,149,000	$ 6,441,000	$ 10,013,000
Restricted Stock Activity [Roll Forward]
Unvested at beginning of year (in shares)		152,644	162,087	260,698
Granted (in shares)		50,217	93,285	80,529
Forfeited (in shares)		0	16,000	910
Vested (in shares)		(59,547)	(86,728)	(178,230)
Unvested at end of year (in shares)		143,314	152,644	162,087
Restricted stock activity weighted average price [Abstract]
Unvested at beginning of year (in dollars per share) \| $ / shares		$ 63.18	$ 51.97	$ 52.68
Granted (in dollars per share) \| $ / shares		84.09	76.70	58.81
Forfeited (in dollars per share) \| $ / shares		0.00	36.98	52.89
Vested (in dollars per share) \| $ / shares		63.77	61.62	56.09
Unvested at end of year (in dollars per share) \| $ / shares		$ 70.26	$ 63.18	$ 51.97
Nonvested Shares Vesting Schedule [Abstract]
2019 (in shares)						53,826
2020 (in shares)						50,650
2021 (in shares)						23,167
2022 (in shares)						13,186
2023 (in shares)						2,485
Total Nonvested Shares (in shares)		152,644	162,087	260,698		143,314	152,644	162,087
Award Recipient Type Director [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Annual Director Retainer Stock Award Amount \| $						$ 86,000
Stock Compensation Plan disclosure [Abstract]
Stock-based compensation cost \| $		$ 1,134,000	$ 670,000	$ 589,000
Award Recipient Type Director [Member] \| Restricted Stock [Member]
Stock Compensation Plan disclosure [Abstract]
Fair value of shares vested as of the vesting date \| $		$ 7,000	$ 9,000	$ 8,000
Management Incentive Plan 2004 [Member]
Stock Compensation Plan disclosure [Abstract]
Authorized shares of common stock (in shares)						1,900,000
Equity Incentive Plan 2013 [Member]
Stock Compensation Plan disclosure [Abstract]
Authorized shares of common stock (in shares)						2,000,000
Shares available for grant (in shares)						1,629,281	1,671,981	1,752,345
Equity Incentive Plan 2013 [Member] \| Restricted Stock [Member] \| Executive Officer [Member]
Stock Compensation Plan disclosure [Abstract]
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other Than Options, Potential Grants in Future Period (maximum)		86,836
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other Than Options, Potential Grants in Future Period (minimum)		0
Equity Incentive Plan 2013 [Member] \| Restricted Stock [Member] \| Service Condition Only Awards [Member] \| Non Executive Officers [Member]
Stock Compensation Plan disclosure [Abstract]
Share awards granted (in shares)		12,425
Restricted Stock Activity [Roll Forward]
Granted (in shares)		12,425
Equity Incentive Plan 2013 [Member] \| Award Recipient Type Employee [Member] \| Restricted Stock [Member] \| Non Executive Officers [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage		20.00%
Stock Compensation Plan disclosure [Abstract]
Grant date fair value of shares issued (in dollars per share) \| $ / shares		$ 95.17
Restricted stock activity weighted average price [Abstract]
Granted (in dollars per share) \| $ / shares		$ 95.17
Equity Incentive Plan 2013 [Member] \| Award Recipient Type Director [Member] \| Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share Based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vesting Rights (% vesting per year in future years)	25.00%				25.00%
Stock Compensation Plan disclosure [Abstract]
Share awards granted (in shares)	282				417
Grant date fair value of shares issued (in dollars per share) \| $ / shares	$ 88.86				$ 59.97
Restricted Stock Activity [Roll Forward]
Granted (in shares)	282				417
Restricted stock activity weighted average price [Abstract]
Granted (in dollars per share) \| $ / shares	$ 88.86				$ 59.97
Award Recipient Type Director [Member]
Stock Compensation Plan disclosure [Abstract]
Shares issued to directors (in shares)		8,478	8,881	10,072
New Director Stock Awards to be Issued in Future Periods [Member] \| Award Recipient Type Director [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
New Director Restricted Stock Award Amount to be Awarded in Future Periods \| $		$ 25,000
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period		4 years
2017 Awards [Member] \| Equity Incentive Plan 2013 [Member] \| Restricted Stock [Member] \| Shareholder Return Awards [Member] \| Executive Officer [Member]
Stock Compensation Plan disclosure [Abstract]
Equity Instruments other than options, number of plans \| Integer		3
2017 Awards [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]
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%
Stock Compensation Plan disclosure [Abstract]
Share awards granted (in shares)		5,406
Grant date fair value of shares issued (in dollars per share) \| $ / shares		$ 78.18
Equity Instruments other than options, number of plans \| Integer		1
Restricted Stock Activity [Roll Forward]
Granted (in shares)		5,406
Restricted stock activity weighted average price [Abstract]
Granted (in dollars per share) \| $ / shares		$ 78.18
2017 Awards [Member] \| Equity Incentive Plan 2013 [Member] \| Award Recipient Type Employee [Member] \| Restricted Stock [Member] \| Company Performance Awards [Member] \| Executive Officer [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share Based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vesting Rights (% vesting per year in future years)		20.00%
Share Based Compensation Arrangement by Share Based Payment Award, Equity Instruments Other Than Options, Percent of vesting that occurred on grant date		20.00%
Stock Compensation Plan disclosure [Abstract]
Share awards granted (in shares)		21,097
Grant date fair value of shares issued (in dollars per share) \| $ / shares		$ 78.18
Restricted Stock Activity [Roll Forward]
Granted (in shares)		21,097
Restricted stock activity weighted average price [Abstract]
Granted (in dollars per share) \| $ / shares		$ 78.18
2017 Awards [Member] \| Equity Incentive Plan 2013 [Member] \| Award Recipient Type Employee [Member] \| Restricted Stock [Member] \| Individual performance awards [Member] \| Executive Officer [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share Based Compensation Arrangement by Share Based Payment Award, Equity Instruments Other Than Options, Percent of vesting that occurred on grant date		20.00%
Stock Compensation Plan disclosure [Abstract]
Share awards granted (in shares)		4,554
Grant date fair value of shares issued (in dollars per share) \| $ / shares		$ 80.93
Share Based Compensation Arrangement By Share Based Payment Award Possible Shares To Be Awarded Vesting Rights		20.00%
Restricted Stock Activity [Roll Forward]
Granted (in shares)		4,554
Restricted stock activity weighted average price [Abstract]
Granted (in dollars per share) \| $ / shares		$ 80.93
2017 Awards [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 [Line Items]
Share Based Compensation Arrangement by Share Based Payment Award, Equity Instruments Other Than Options, Percent of vesting that occurred on grant date		100.00%
Stock Compensation Plan disclosure [Abstract]
Share awards granted (in shares)		4,257
Restricted Stock Activity [Roll Forward]
Granted (in shares)		4,257
Nonvested Shares Vesting Schedule [Abstract]
Number of years in total shareholder return performance period \| Integer		1
2017 Awards [Member] \| Two year period [Member] \| Equity Incentive Plan 2013 [Member] \| Restricted Stock [Member] \| Shareholder Return Awards [Member] \| Executive Officer [Member]
Stock Compensation Plan disclosure [Abstract]
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other Than Options, Potential Grants in Future Period (maximum)		9,460
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, Percent of future vesting that will occur on grant date		100.00%
Nonvested Shares Vesting Schedule [Abstract]
Number of years in total shareholder return performance period \| Integer		2
2017 Awards [Member] \| Three year period [Member] \| Equity Incentive Plan 2013 [Member] \| Restricted Stock [Member] \| Shareholder Return Awards [Member] \| Executive Officer [Member]
Stock Compensation Plan disclosure [Abstract]
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other Than Options, Potential Grants in Future Period (maximum)		18,917
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, Percent of future vesting that will occur on grant date		75.00%
Share Based Compensation Arrangement By Share Based Payment Award Possible Shares To Be Awarded Vesting Rights		25.00%
Nonvested Shares Vesting Schedule [Abstract]
Number of years in total shareholder return performance period \| Integer		3
2018 Awards [Member] \| Equity Incentive Plan 2013 [Member] \| Restricted Stock [Member] \| Shareholder Return Awards [Member] \| Executive Officer [Member]
Stock Compensation Plan disclosure [Abstract]
Equity Instruments other than options, number of plans \| Integer		1
2018 Awards [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]
Share Based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vesting Rights (% vesting per year in future years)		25.00%
Stock Compensation Plan disclosure [Abstract]
Share awards granted (in shares)		7,884
Grant date fair value of shares issued (in dollars per share) \| $ / shares		$ 95.19
Restricted Stock Activity [Roll Forward]
Granted (in shares)		7,884
Restricted stock activity weighted average price [Abstract]
Granted (in dollars per share) \| $ / shares		$ 95.19
2018 Awards [Member] \| Equity Incentive Plan 2013 [Member] \| Award Recipient Type Employee [Member] \| Restricted Stock [Member] \| Company Performance Awards [Member] \| Executive Officer [Member]
Stock Compensation Plan disclosure [Abstract]
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other Than Options, Potential Grants in Future Period (maximum)		24,690
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, Potential Grants in Future Period (minimum)		0
Share Based Compensation Arrangement by Share Based Payment Award, Equity Instruments Other Than Options, Percent of future vesting that will occur on grant date		20.00%
Share Based Compensation Arrangement By Share Based Payment Award Possible Shares To Be Awarded Vesting Rights		20.00%
Restricted stock activity weighted average price [Abstract]
Granted (in dollars per share) \| $ / shares		$ 95.19
2018 Awards [Member] \| Equity Incentive Plan 2013 [Member] \| Award Recipient Type Employee [Member] \| Restricted Stock [Member] \| Individual performance awards [Member] \| Executive Officer [Member]
Stock Compensation Plan disclosure [Abstract]
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other Than Options, Potential Grants in Future Period (maximum)		6,173
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, Percent of future vesting that will occur on grant date		20.00%
Share Based Compensation Arrangement By Share Based Payment Award Possible Shares To Be Awarded Vesting Rights		20.00%
2018 Awards [Member] \| Three year period [Member] \| Equity Incentive Plan 2013 [Member] \| Restricted Stock [Member] \| Shareholder Return Awards [Member] \| Executive Officer [Member]
Stock Compensation Plan disclosure [Abstract]
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other Than Options, Potential Grants in Future Period (maximum)		27,596
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, Percent of future vesting that will occur on grant date		75.00%
Share Based Compensation Arrangement By Share Based Payment Award Possible Shares To Be Awarded Vesting Rights		25.00%
Nonvested Shares Vesting Schedule [Abstract]
Number of years in total shareholder return performance period \| Integer		3