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STOCK-BASED COMPENSATION (Tables)
 6 Months Ended
Jun. 30, 2017
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Summary of total shares granted, forfeited and delivered
Following is a summary of the total restricted shares granted, forfeited and delivered (vested) to participants with the related weighted average grant date fair value share prices.  Of the shares that vested in the first six months of 2017, the Company withheld 33,695 shares to satisfy the tax obligations for those participants who elected this option as permitted under the applicable equity plan.  As of the vesting dates, the aggregate fair value of shares that vested during the first six months of 2017 was $6,441,000.
 
Three Months Ended
 
Six Months Ended
Award Activity:
June 30, 2017
 
June 30, 2017
 
 
 
Shares
 
Weighted Average Grant Date Fair Value
 
 
 
Shares
 
Weighted Average Grant Date Fair Value
Unvested at beginning of period
129,323

 
$
59.70

 
162,191

 
$
51.98

Granted (1)
23,425

 
82.37

 
93,285

 
76.70

Forfeited 
—

 
—

 
(16,000
)
 
36.98

Vested 
—

 
—

 
(86,728
)
 
61.62

Unvested at end of period 
152,748

 
$
63.18

 
152,748

 
$
63.18



(1) Does not include the restricted shares that may be earned if the performance goals established in 2017 for annual and long-term performance periods 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 59,477.