Annual Director Retainer Stock Award Amount

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.

+ References

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.

+ Details

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- Definition

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No definition available.

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- Definition

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No definition available.

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- Definition

For a share-based compensation arrangement grant award, the percentage of the total award vesting as a group or grouping of awards annual in accordance with the established vesting schedule at grant date.

+ References

No definition available.

+ Details

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- Definition

The 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 during the reporting period as a result of the occurrence of a terminating event specified in the contractual agreement of the plan.

+ References

No definition available.

+ Details

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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.

+ References

No definition available.

+ Details

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- Definition

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

+ References

No definition available.

+ Details

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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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- Definition

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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- 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.

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

+ References

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.)

+ References

No definition available.

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

+ References

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

+ References

No definition available.

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- Definition

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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No definition available.

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- Definition

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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No definition available.

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- Definition

Share-based compensation arrangement by Share-based payment award, % vesting after grant date and before date report was filed

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No definition available.

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- Definition

Share-based compensation arrangements by share-based payment award, equity instruments other than options, percent of vesting that occurred during period

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No definition available.

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- Definition

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

+ References

No definition available.

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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
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-Name Accounting Standards Codification
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-SubTopic 10
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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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- References

No definition available.

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- Definition

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

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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).

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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).

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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.

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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.

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No definition available.

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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.

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- Definition

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

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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.

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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.

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No definition available.

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- Definition

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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- 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.

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- Definition

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

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- Definition

Percentage of vesting of share-based compensation awards.

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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.

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No definition available.

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STOCK-BASED COMPENSATION (Details) - USD ($)	12 Months Ended
STOCK-BASED COMPENSATION (Details) - USD ($)	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Stock Compensation Plan disclosure [Abstract]
Stock-based compensation cost	$ 5,831,000	$ 8,423,000	$ 6,567,000
Award Recipient Type Employee [Member] \| Restricted Stock [Member]
Stock Compensation Plan disclosure [Abstract]
Stock-based compensation cost	5,184,000	7,891,000	6,071,000
Stock based compensation cost capitalized as development costs	$ 1,183,000	$ 1,672,000	$ 1,415,000
Share awards granted (in shares)	80,529	100,622	71,642
Grant date fair value of shares issued (in dollars per share)	$ 58.81	$ 61.07	$ 61.96
Compensation is recognized over a weighted average period (in years)	2 years 8 months 12 days
Share based compensation, share based payment arrangements other than stock options, unrecognized cost associated with awards not yet vested	$ 4,577,000
Shares withheld to satisfy the tax obligations (in shares)	57,316	32,409	31,673
Fair value of shares granted	$ 4,736,000	$ 6,145,000	$ 4,439,000
Fair value of shares vested as of the vesting date	$ 10,013,000	$ 6,664,000	$ 5,712,000
Restricted Stock Activity [Roll Forward]
Unvested at beginning of year (in shares)	260,698	265,911	293,989
Granted (in shares)	80,529	100,622	71,642
Forfeited (in shares)	(910)	0	(2,375)
Vested (in shares)	(178,230)	(105,835)	(97,345)
Unvested at end of year (in shares)	162,087	260,698	265,911
Restricted stock activity weighted average price [Abstract]
Unvested at beginning of year (in dollars per share)	$ 52.68	$ 49.79	$ 47.17
Granted (in dollars per share)	58.81	61.07	61.96
Forfeited (in dollars per share)	52.89	0.00	52.72
Vested (in dollars per share)	56.09	53.40	50.76
Unvested at end of year (in dollars per share)	$ 51.97	$ 52.68	$ 49.79
Nonvested Shares Vesting Schedule [Abstract]
2017 (in shares)				51,064
2018 (in shares)				41,491
2019 (in shares)				35,062
2020 (in shares)				31,420
2021 (in shares)				3,050
Total Nonvested Shares (in shares)	260,698	265,911	293,989	162,087	260,698	265,911
Award Recipient Type Director [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Annual Director Retainer Stock Award Amount				$ 80,000
Stock Compensation Plan disclosure [Abstract]
Stock-based compensation cost	$ 589,000	$ 514,000	$ 490,000
Award Recipient Type Director [Member] \| Restricted Stock [Member]
Stock Compensation Plan disclosure [Abstract]
Fair value of shares vested as of the vesting date	$ 8,000	$ 6,000	$ 7,000
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)				1,752,345	1,802,000	1,900,800
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]
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)	37,848
Grant date fair value of shares issued (in dollars per share)	$ 56.05
Percentage of shares granted vesting annually in future periods (in hundredths)				20.00%
Restricted Stock Activity [Roll Forward]
Granted (in shares)	37,848
Restricted stock activity weighted average price [Abstract]
Granted (in dollars per share)	$ 56.05
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	25.00%
Stock Compensation Plan disclosure [Abstract]
Share awards granted (in shares)	27,431
Grant date fair value of shares issued (in dollars per share)	$ 56.05
Percentage of shares granted vesting annually in future periods (in hundredths)				25.00%
Restricted Stock Activity [Roll Forward]
Granted (in shares)	27,431
Restricted stock activity weighted average price [Abstract]
Granted (in dollars per share)	$ 56.05
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, % vesting after grant date and before date report was filed	20.00%
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage	20.00%
Stock Compensation Plan disclosure [Abstract]
Share awards granted (in shares)	15,250
Grant date fair value of shares issued (in dollars per share)	$ 70.62
Restricted Stock Activity [Roll Forward]
Granted (in shares)	15,250
Restricted stock activity weighted average price [Abstract]
Granted (in dollars per share)	$ 70.62
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)	44,848
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%
Equity Incentive Plan 2013 [Member] \| Award Recipient Type Employee [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)	47,275
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	25.00%
Share Based Compensation Arrangement By Share Based Payment Award Possible Shares To Be Awarded Vesting Rights	25.00%
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 arrangements by share-based payment award, equity instruments other than options, percent of vesting that occurred during period	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)			417
Grant date fair value of shares issued (in dollars per share)			$ 59.97
Restricted Stock Activity [Roll Forward]
Granted (in shares)			417
Restricted stock activity weighted average price [Abstract]
Granted (in dollars per share)			$ 59.97
Award Recipient Type Director [Member]
Stock Compensation Plan disclosure [Abstract]
Shares issued to directors (in shares)	10,072	9,373	7,742
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