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STOCK-BASED COMPENSATION (Tables)
 12 Months Ended
Dec. 31, 2019
Share-based Payment Arrangement [Abstract]  
Activity of unvested restricted stock units
The following table summarizes the activity of restricted stock units for employees and non-employee directors during the years ended December 31, 2017, 2018 and 2019: 
Restricted Stock Units
 
Shares
Weighted-Average Grant
Date Fair Value
 
 
 
 
 
 
Unvested at December 31, 2016
 
195,059

 
$
1,300

 
 
 
 
 
 
 
Granted
 
100,614

 
$
1,745

 
Vested
 
(67,041
)
 
$
1,302

 
Forfeited/Canceled
 
(24,671
)
 
$
1,430

 
Unvested at December 31, 2017
 
203,961

 
$
1,503

 
 
 
 
 
 
 
Granted
 
116,583

 
$
2,025

 
Vested
 
(69,693
)
 
$
1,389

 
Forfeited/Canceled
 
(25,868
)
 
$
1,731

 
Unvested at December 31, 2018
 
224,983

 
$
1,783

 
 
 
 
 
 
 
Granted
 
157,205

 
$
1,739

 
Vested
 
(95,484
)
 
$
1,653

 
Forfeited/Canceled
 
(29,959
)
 
$
1,812

 
Unvested at December 31, 2019
 
256,745

 
$
1,801

 
Activity of unvested performance share units
The following table summarizes the activity of performance share units for employees during the years ended December 31, 2017, 2018 and 2019:
Performance Share Units
 
Shares
Weighted-Average Grant
Date Fair Value
 
 
 
 
 
 
Unvested at December 31, 2016
 
320,547

 
$
1,288

 
 
 
 
 
 
 
Granted
 
73,893

 
$
1,735

 
Vested
 
(76,730
)
 
$
1,328

 
Performance Shares Adjustment
 
19,357

 
$
1,501

 
Forfeited/Canceled
 
(16,332
)
 
$
1,395

 
Unvested at December 31, 2017
 
320,735

 
$
1,386

 
 
 
 
 
 
 
Granted
 
49,721

 
$
2,034

 
Vested
 
(134,549
)
 
$
1,250

 
Performance Shares Adjustment
 
66,245

 
$
1,872

 
Forfeited/Canceled
 
(15,573
)
 
$
1,685

 
Unvested at December 31, 2018
 
286,579

 
$
1,659

 
 
 
 
 
 
 
Granted
 
61,912

 
$
1,716

 
Vested
 
(118,668
)
 
$
1,346

 
Performance Shares Adjustment
 
(683
)
 
$
1,729

 
Forfeited/Canceled
 
(13,057
)
 
$
1,769

 
Unvested at December 31, 2019
 
216,083

 
$
1,835

 
Estimated vesting of performance share units granted
The following table summarizes the estimated vesting of performance share units granted in 2019, 2018 and 2017, net of forfeiture and vesting since the respective grant dates, at December 31, 2019:
Performance Share Units, by grant year
 
2019
 
2018
 
2017
Shares probable to be issued
 
60,588

 
76,560

 
78,935

Shares not subject to the achievement of minimum performance thresholds
 
47,170

 
29,753

 
N/A*

Shares that could be issued if maximum performance thresholds are met
 
121,176

 
82,126

 
N/A*


* The performance period for the performance share units granted in 2017 ended on December 31, 2019.
Activity of outstanding stock options
The following table summarizes the activity for stock options during the year ended December 31, 2019:
Employee Stock Options
 
Number of Shares
 
Weighted-Average
 Exercise Price
 
Aggregate
 Intrinsic Value (in millions)
 
Weighted-Average Remaining Contractual Term (in years)
Balance, December 31, 2018
 
27,263

 
 
$
387

 
 
$
36

 
2.8
Exercised
 
(12,141
)
 
 
$
266

 
 
 
 
 
Balance, December 31, 2019
 
15,122

 
 
$
484

 
 
$
24

 
2.6
Vested and exercisable at December 31, 2019
 
15,122

 
 
$
484

 
 
$
24

 
2.6