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STOCK-BASED COMPENSATION
 12 Months Ended
Dec. 31, 2019
Share-based Payment Arrangement [Abstract]  
STOCK-BASED COMPENSATION STOCK-BASED COMPENSATION
Stock-Based Compensation
In 2010, the Company adopted an equity incentive plan (the "2010 Plan"), which provides for awards of up to 6,000,000 shares of common stock (subject to certain anti-dilution adjustments) in the form of (i) stock options, (ii) stock appreciation rights, (iii) restricted stock, (iv) restricted stock units, and (v) certain other stock-based awards. The Company ceased issuing stock options in 2008, and all awards issued to date under the 2010 Plan have been in the form of restricted stock awards and performance stock awards as described below.
As of December 31, 2019 and 2018, the Company had restricted stock awards and performance stock awards outstanding under the 2010 Plan. The restricted stock awards generally vest over three to five years subject to continued employment. The performance stock awards vest depending on the satisfaction of certain performance criteria and continued service conditions as described below.
Total stock-based compensation cost charged to selling, general and administrative expenses for the years ended December 31, 2019, 2018 and 2017 was $17.8 million, $16.8 million and $13.1 million, respectively. The total income tax benefit recognized in the consolidated statements of operations from stock-based compensation was $3.1 million, $3.2 million and $3.7 million for the years ended December 31, 2019, 2018 and 2017, respectively.
Restricted Stock Awards
The following table summarizes information about restricted stock awards for the year ended December 31, 2019:
Restricted Stock
Number of
Shares
 
Weighted Average
Grant-Date
Fair Value
Unvested at January 1, 2019
657,240

 
$
54.65

Granted
174,114

 
68.82

Vested
(249,319
)
 
53.99

Forfeited
(59,438
)
 
55.65

Unvested at December 31, 2019
522,597

 
$
59.57


As of December 31, 2019, there was $20.6 million of total unrecognized compensation cost arising from restricted stock awards. This cost is expected to be recognized over a weighted average period of 2.6 years. The total fair value of restricted stock vested during 2019, 2018 and 2017 was $16.8 million, $10.8 million and $7.3 million, respectively.
Performance Stock Awards
The following table summarizes information about performance stock awards for the year ended December 31, 2019:
Performance Stock
Number of
Shares
 
Weighted Average
Grant-Date
Fair Value
Unvested at January 1, 2019
213,490

 
$
55.71

Granted
125,034

 
70.77

Vested
(105,583
)
 
55.68

Forfeited
(28,388
)
 
56.82

Unvested at December 31, 2019
204,553

 
$
64.78


As of December 31, 2019, there was $2.8 million of total unrecognized compensation cost arising from performance stock awards whereby the performance conditions had been met or were deemed probable of vesting. The total fair value of performance awards vested during 2019, 2018 and 2017 was $8.1 million, $1.2 million and $3.0 million, respectively.