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STOCK-BASED COMPENSATION (Tables)
 12 Months Ended
Dec. 31, 2019
Share-based Payment Arrangement [Abstract]  
Schedule of Assumptions for Restricted Stock Awards The range of assumptions used to estimate the fair value of performance-based restricted stock awards granted were as follows:
 
 
2018
 
2017
Expected term (years)
 
0.7 - 0.9
 
0.6 - 0.9
Expected volatility
 
40.4%
 
36.9%
Risk-free interest rate
 
2.4%
 
1.7%
Vesting price(1)
 
$91.10 - $99.10
 
$82.50 - $91.75
Weighted average grant date fair value per share
 
$48.14 - $52.81
 
$44.96 - $51.31


(1)
The vesting price is the average of the daily volume-weighted average share price of our common stock over any period of 20 consecutive trading days within the three-year period beginning on the date of grant.

The assumptions used to estimate the fair value of performance-based restricted stock units granted in 2019 were as follows:

 
 
2019
Expected term (years)
 
0.0 - 0.5
Expected volatility
 
41.1%
Risk-free interest rate
 
2.1%
Vesting price(1)
 
$45.90 - $58.60
Weighted average grant date fair value per share
 
$39.60 - $48.75

(1)
The vesting price is the average of the daily volume-weighted average share price of our common stock over any period of 20 consecutive trading days within the three-year period beginning on the date of grant. These hurdles were established on March 1, 2019.
Schedule of Restricted Stock Unit Activity
RSU activity for 2019 was as follows (units in thousands): 
 

Number
of
Units
 

Weighted Average
 Grant Date
 Fair Value Per Share
Unvested RSUs outstanding at beginning of period

22

 

$
49.94

Granted

474

(1) 

46.26

Vested

(144
)
 

47.16

Forfeited

(21
)
 

45.65

Unvested RSUs outstanding at end of period

331

 

$
46.15



(1)
Reflects the 2019 RSU Grant at the maximum 200% of the target.

Additional RSU information was as follows: 
 
 
2019
 
2018
 
2017
Weighted average fair value per share on grant date(1)
 
$
46.26

 
$
49.94

 
$
76.30

Fair value of vested units (in millions)
 
$
6.8

 
$
0.8

 
$
0.8


(1)
The fair value was determined based upon the closing price of our common stock on the effective date of the grant.
Schedule of Restricted Stock Award Activity
Restricted stock award activity for 2019 was as follows (shares in thousands): 
 
 
Number
of
Shares
 
Weighted
Average
 Grant Date
 Fair Value Per Share
Unvested restricted stock awards outstanding at beginning of period
 
326

 
$
59.93

Granted
 
—

 
—

Vested
 
(97
)
 
64.04

Forfeited
 
(21
)
 
57.40

Unvested restricted stock awards outstanding at end of period
 
208

 
$
58.20