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Stock-Based Compensation
 12 Months Ended
Dec. 31, 2021
Share-based Payment Arrangement [Abstract]  
Stock-Based Compensation Stock-Based CompensationWe have a long-term incentive plan (“LTIP”) that provides for the grant of various stock-based compensation awards at the discretion of our compensation committee of our board of directors. Employees and non-employee directors are eligible
to receive awards under the LTIP. Stock-based awards granted pursuant to the LTIP are expected to be settled in shares of our Class A common stock if they vest. Our stock-based awards do not have voting rights prior to vesting. Dividends declared are accumulated and paid upon vesting. We account for forfeitures when they occur and recognize the impact to stock-based compensation expense at that time. We recorded $8.6 million of stock-based compensation expense during each of the years ended December 31, 2021 and 2020 and $7.0 million during the year ended December 31, 2019. Stock-based compensation expense is primarily recorded in selling, general and administrative expenses. We recognized $1.1 million, $34 thousand and $0.8 million in tax benefits for tax deductions from the vesting of stock-based awards benefits during the years ended December 31, 2021, 2020 and 2019, respectively. As of December 31, 2021, 1.3 million stock awards were available for grant.
Restricted Stock Units
Restricted stock units (“RSUs”) granted to our key employees generally vest over a three-year period (vesting ratably in equal tranches over a three-year period); however, RSUs granted to our non-employee directors generally vest on the first anniversary of the grant date. We recognize compensation expense over the requisite service period using straight-line amortization.
The following table summarizes our RSU activity during the year ended December 31, 2021 (RSUs in thousands):
 No. of RSUsWeighted Average Grant Date Fair Value ($)
Nonvested as of December 31, 2020757 $19.97 
Granted168 32.92 
Vested(447)20.20 
Forfeited(2)26.83 
Nonvested as of December 31, 2021476 $24.29 
There was approximately $6.6 million of unrecognized compensation expense relating to the unvested RSUs as of December 31, 2021. The unrecognized compensation expense will be recognized over the weighted average remaining vesting period of 1.8 years.
Performance Stock Units
Performance stock units (“PSUs”) are granted to our executive officers. Under these awards, the number of shares vested and earned is currently determined at the end of a three-year performance period based on our Return on Capital Employed (“ROCE”). The number of shares earned may range from 0% to 200% of the target units set forth in the applicable award agreement and is determined at the end of the performance period conditioned upon continued service and on our achievement of certain predefined targets as defined in the underlying performance stock unit agreements. PSUs cliff vest upon conclusion of the three-year performance period. As the ROCE target represents a performance condition, we recognize compensation expense for the performance share units on a straight-line basis over three years based on the probable outcome of the ROCE performance.
In 2020, we granted PSU awards that contained a two-year performance period. Our ROCE performance did not meet the minimum requirements for vesting; therefore, those awards were forfeited as of December 31, 2021. As of December 31, 2020, we had not recognized compensation expense related to any of the 2020 awards as it was not probable that the minimum performance level would be achieved for each award as determined by the actual and forecasted ROCE performance over the applicable performance periods. In 2021, we recorded a cumulative catch-up of compensation expense for the three-year awards as it was probable that the minimum ROCE performance level will be achieved.
The following table summarizes our PSU activity during the year ended December 31, 2021 (PSUs in thousands at their target values which assumes achievement of 100% of target):
No. of PSUsWeighted Average Grant Date Fair Value ($)
Nonvested as of December 31, 2020152 $13.66 
Granted74 32.82 
Vested— — 
Forfeited(28)13.66 
Nonvested as of December 31, 2021198 $20.80 
As of December 31, 2021, there was approximately $2.2 million of unrecognized compensation expense relating to the unvested PSUs (based on the grant date fair value of the awards at 100% of target) which is expected to be recognized over a weighted average period of 1.7 years.