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STOCKHOLDERS' EQUITY (Details) - USD ($) |  | 12 Months Ended
--- | --- | ---
Sep. 14, 2010 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Stock Based Compensation |  |  |  |
Outstanding options at the end of the period (in shares) |  | 0 | 0 | 0
Total charge to operations and other disclosure for all incentive plans, including the 200,000 Units, is as follows: |  |  |  |
Share based compensation charged to operations |  | $ 2,334,000 | $ 1,833,000 | $ 1,440,000
Compensation costs related to non-vested awards that have not yet been recognized |  | $ 5,719,000 |  |
Approximate weighted average vesting period |  | 2 years 1 month 6 days |  |
Restricted stock grants |  |  |  |
Stock Based Compensation |  |  |  |
Vesting period |  | 5 years |  |
Summary of the activity of the incentive plans |  |  |  |
Restricted stock grants |  | 129,975 | 118,850 | 112,650
Per share grant price (in dollars per share) |  | $ 24.60 | $ 20.54 | $ 21.59
Deferred compensation to be recognized over vesting period |  | $ 3,197,000 | $ 2,441,000 | $ 2,432,000
Number of non-vested shares: |  |  |  |
Non-vested beginning of period (in shares) |  | 480,995 | 470,015 | 407,460
Grants (in shares) |  | 129,975 | 118,850 | 112,650
Vested during period (in shares) |  | (72,215) | (101,300) | (50,095)
Forfeitures (in shares) |  |  | (6,570) |
Non-vested end of period (in shares) |  | 538,755 | 480,995 | 470,015
Other disclosures |  |  |  |
Average per share value of non-vested shares (based on grant price) (in dollars per share) |  | $ 17.12 | $ 14.55 | $ 14.22
Value of stock vested during the period (based on grant price) |  | $ 612,000 | $ 621,000 | $ 876,000
Average value of shares forfeited (based on grant price) (in dollars per share) |  |  | $ 15.49 |
Total charge to operations and other disclosure for all incentive plans, including the 200,000 Units, is as follows: |  |  |  |
Share based compensation charged to operations |  | 2,204,000 | $ 1,701,000 | 1,341,000
Restricted stock units |  |  |  |
Total charge to operations and other disclosure for all incentive plans, including the 200,000 Units, is as follows: |  |  |  |
Share based compensation charged to operations |  | $ 130,000 | $ 132,000 | $ 99,000
2012 Incentive Plan |  |  |  |
Stock Based Compensation |  |  |  |
Number of shares authorized for issuance |  | 600,000 |  |
Shares issued pursuant to plan |  | 358,475 |  |
Prior Incentive Plans |  |  |  |
Summary of the activity of the incentive plans |  |  |  |
Restricted stock grants |  | 0 |  |
Number of non-vested shares: |  |  |  |
Grants (in shares) |  | 0 |  |
Non-vested end of period (in shares) |  | 380,280 |  |
Pay-for-performance program |  |  |  |
Total charge to operations and other disclosure for all incentive plans, including the 200,000 Units, is as follows: |  |  |  |
Compensation costs related to non-vested awards that have not yet been recognized |  | $ 167,000 |  |
Pay-for-performance program | Restricted stock units |  |  |  |
Stock Based Compensation |  |  |  |
Vesting period | 7 years |  |  |
Number of share instruments vested since plan's inception |  | 1 |  |
Number of shares to be issued for each unit outstanding on not satisfying performance criteria at June 30, 2017 |  | 0 |  |
Summary of the activity of the incentive plans |  |  |  |
Restricted stock grants | 200,000 |  |  |
Per share grant price (in dollars per share) | $ 11.74 |  |  |
Deferred compensation to be recognized over vesting period | $ 822,000 |  |  |
Number of non-vested shares: |  |  |  |
Grants (in shares) | 200,000 |  |  |
Vested during period (in shares) |  | 0 | 0 | 0
Forfeitures (in shares) |  | 0 | 0 | 0

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