STOCK-BASED COMPENSATION (Details) (USD $) | 3 Months Ended | 9 Months Ended |
Sep. 30, 2013 | Sep. 30, 2012 | Sep. 30, 2013 | Sep. 30, 2012 |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | | | | |
Allocated Share-based Compensation Expense | | | ($4,324,000) | |
Management Incentive Plan 2004 [Member] | | | | |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | | | | |
Authorized shares of common stock | 1,900,000 | | 1,900,000 | |
Directors Equity Plan 2005 [Member] | | | | |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | | | | |
Authorized shares of common stock | 50,000 | | 50,000 | |
Equity Incentive Plan 2013 [Member] | | | | |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | | | | |
Authorized shares of common stock | 2,000,000 | | 2,000,000 | |
Shares available for grant | 1,972,138 | | 1,972,138 | |
Award Recipient Type Employee [Member] | | | | |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | | | | |
Stock-based compensation costs capitalized as development costs | 294,000 | 212,000 | 986,000 | 669,000 |
Allocated Share-based Compensation Expense | 1,066,000 | 870,000 | 3,905,000 | 3,210,000 |
Grant date fair value of shares issued (in dollars per share) | $55.34 | | $56.77 | |
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) | 273,039 | | 212,206 | |
Granted (in shares) | 20,950 | | 112,099 | |
Forfeited (in shares) | 0 | | 0 | |
Vested (in shares) | 0 | | -30,316 | |
Unvested at end of period (in shares) | 293,989 | | 293,989 | |
Weighted Average Grant Date Fair Value [Abstract] | | | | |
Unvested at beginning of period (per share) | $46.55 | | $42.84 | |
Granted (per share) | $55.34 | | $56.77 | |
Forfeited (per share) | $0 | | $0 | |
Vested (per share) | $0 | | $52.32 | |
Unvested at end of period (per share) | $47.17 | | $47.17 | |
Award Recipient Type Employee [Member] | Restricted Stock [Member] | | | | |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | | | | |
Shares withheld for tax obligations | | | 17,927 | |
Fair value of shares vested as of the vesting date | | | 1,700,000 | |
Award Recipient Type Employee [Member] | Equity Incentive Plan 2013 [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 | 20.00% | | | |
Grant date fair value of shares issued (in dollars per share) | $55.34 | | | |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward] | | | | |
Granted (in shares) | 20,950 | | | |
Weighted Average Grant Date Fair Value [Abstract] | | | | |
Granted (per share) | $55.34 | | | |
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] | | | | |
Share Based Compensation Arrangement By Share Based Payment Award Possible Shares To Be Awarded Vesting Rights (% Vesting Per Year in Future Years) | 20.00% | | | |
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) | 42,780 | | | |
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% | | | |
Award Recipient Type Employee [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 Possible Shares To Be Awarded Vesting Rights (% Vesting Per Year in Future Years) | 25.00% | | | |
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) | 45,288 | | | |
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% | | | |
Award Recipient Type Director [Member] | | | | |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | | | | |
Annual Director Retainer Stock Award Amount | 70,000 | | 70,000 | |
Allocated Share-based Compensation Expense | 105,000 | 90,000 | 285,000 | 240,000 |
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 | |