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Stockholders' Equity (Tables)
12 Months Ended
Dec. 31, 2021
Equity [Abstract]  
Schedule of Compensation Cost for Share-based Payment Arrangements, Allocation of Share-based Compensation Costs by Plan The following table summarizes our compensation costs recognized in General and administrative expense (excluding depreciation) and Operating expense (excluding depreciation) under the Incentive Plan and Stock Purchase Plan (in thousands):
Years Ended December 31,
202120202019
Restricted Stock Awards$4,657 $3,939 $3,490 
Restricted Stock Units$1,356 $1,510 $1,269 
Stock Option Awards$1,939 $1,660 $1,454 
Share-based Payment Arrangement, Restricted Stock and Restricted Stock Unit, Activity
The following tables summarize our restricted stock activity (in thousands, except per share amounts):
SharesWeighted-
Average
Grant Date Fair
Value
Unvested balance at December 31, 2020629 $16.89 
Granted485 16.38 
Vested(292)14.97 
Forfeited(62)17.50 
Unvested balance at December 31, 2021760 $17.19 
Years Ended December 31,
202120202019
Weighted-average grant-date fair value per share of restricted stock awards and restricted stock units granted (in dollars)$16.38 $16.97 $17.43 
Fair value of restricted stock awards and restricted stock units vested$4,370 $3,787 $3,693 
The following tables summarize our performance restricted stock activity (in thousands, except per unit amounts):
UnitsWeighted-
Average
Grant Date Fair
Value
Unvested balance at December 31, 2020139 $18.02 
Granted64 16.52 
Vested(45)17.34 
Forfeited— — 
Unvested balance at December 31, 2021158 $17.61 
Years Ended December 31,
202120202019
Weighted-average grant-date fair value per share of performance restricted stock units granted (in dollars)$16.52 $19.73 $17.00 
Fair value of performance restricted stock units granted$1,053 $919 $811 
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value The weighted-average assumptions used to measure stock options granted during 2021, 2020, and 2019 are presented below.
202120202019
Expected life from date of grant (in years)5.35.35.3
Expected volatility53.2%33.2%34.3%
Risk-free interest rate0.64%1.31%2.46%
Schedule of Share-based Compensation, Stock Options, Activity The following table summarizes our stock option activity (in thousands, except per share amounts and term years):
Number of OptionsWeighted-Average
Exercise
Price
Weighted-Average
Remaining
Contractual
Term in Years
Aggregate
Intrinsic
Value
Outstanding balance at December 31, 20202,128 $19.26 4.1$— 
Issued382 16.52 
Exercised(4)14.60 
Forfeited / canceled / expired(311)21.29 
Outstanding balance at December 31, 20212,195 $18.50 4.2$446 
Exercisable, end of year1,400 $19.07 3.0$446