XML 115 R51.htm IDEA: XBRL DOCUMENT v3.20.4
Stockholders' Equity (Tables)
 12 Months Ended
Dec. 31, 2020
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,
202020192018
Restricted Stock Awards$3,939 $3,490 $3,483 
Restricted Stock Units$1,510 $1,269 $835 
Stock Option Awards$1,660 $1,454 $1,878 
Share-based Payment Arrangement, Restricted Stock and Restricted Stock Unit, Activity
The following table summarizes our restricted stock activity (in thousands, except per share amounts):
SharesWeighted-
Average
Grant Date Fair
Value
Unvested balance at December 31, 2019538 $16.95 
Granted337 16.97 
Vested(225)16.83 
Forfeited(21)18.53 
Unvested balance at December 31, 2020629 $16.89 
The following table summarizes our performance restricted stock activity (in thousands, except per unit amounts):
UnitsWeighted-
Average
Grant Date Fair
Value
Unvested balance at December 31, 2019146 $16.33 
Granted47 19.73 
Vested(54)14.60 
Forfeited— — 
Unvested balance at December 31, 2020139 $18.02 
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 2020, 2019, and 2018 are presented below.
202020192018
Expected life from date of grant (years)5.35.35.3
Expected volatility33.2%34.3%36.2%
Risk-free interest rate1.31%2.46%2.50%
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, 20192,030 $19.31 4.7$7,981 
Issued279 19.73 
Exercised— — 
Forfeited / canceled(181)20.56 
Outstanding balance at December 31, 20202,128 $19.26 4.1$— 
Exercisable, end of year1,451 $19.86 3.1$—