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Share-Based Compensation (Tables)
 12 Months Ended
Dec. 31, 2021
Share-based Payment Arrangement [Abstract]  
Components of Share-Based Compensation Expense by Type of Award The following table lists the components of share-based compensation expense by type of award.
 Years Ended December 31,
 202120202019
Stock options$253 $741 $881 
Restricted stock2,166 3,473 1,897 
Performance share units1,420 755 1,155 
Change in estimate of share-based award vesting (1)
(623)(743)(1,111)
Share-based compensation expense$3,216 $4,226 $2,822 
_______________________________
(1) Amounts reflect the decrease in share-based compensation expense based on the change in estimate of the probability of vesting of share-based awards.
Weighted Average Assumptions Relevant to Determining the Fair Value at the Dates of Grant and Stock Option Modification
The following table shows the weighted average assumptions relevant to determining the fair value of stock options granted in each year.
20202019
Expected term6 years6 years
Average risk-free interest rate1.42 %2.47 %
Expected dividend yield— %3.53 %
Expected volatility52.80 %49.53 %
Expected forfeiture rate— %4.00 %
Reconciliation of Option Activity
The following table presents stock option activity for the year ended December 31, 2021.
Number of Options
(in thousands)		Weighted-
Average
Exercise
Price
(per share)		Weighted-
Average
Remaining
Contractual
Term (years)		Aggregate
Intrinsic
Value		 
Outstanding at January 1, 2021871 $12.41 
Exercised(6)7.93 $8  
Forfeited(22)9.29 
Expired(222)13.31 
Outstanding at December 31, 2021621 $12.24 3.8 years$— (1)
Exercisable at December 31, 2021532 $12.80 3.2 years$— (1)
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(1)The aggregate intrinsic value is the sum of intrinsic values for each exercisable individual option grant. The intrinsic value is the amount by which the closing market price of our stock at December 31, 2021, was greater than the exercise price of any individual option grant.
Reconciliation of Restricted Stock Option Activity
The following table presents the status of unvested restricted stock awards as of December 31, 2021, and changes during the year then ended.
Nonvested
Restricted
Shares
(in thousands)		Weighted
Average
Grant-Date
Fair Value
(per share)
Unvested at January 1, 2021385 $9.42 
Granted459 6.84 
Vested(303)9.34 
Forfeited(72)7.22 
Unvested at December 31, 2021469 $7.28 
Schedule of Performance Based Awards Goals with Respect to TSR and ROIC
The following tables present the goals with respect to TSR Awards and ROIC Awards granted in 2021, 2020, and 2019.
TSR Awards:
Threshold Performance
(50% of Shares)		Target Performance
(100% of Shares)		Maximum Performance
(150% of Shares)
2021 grants35 th Percentile50 th Percentile75 th Percentile
2020 grants35 th Percentile50 th Percentile75 th Percentile
2019 grants35 th Percentile50 th Percentile75 th Percentile
ROIC Awards:
Threshold Performance
(35% or 50% of Shares)(1)
Target Performance
(100% of Shares)		Maximum Performance
(150% of Shares)
2021 grants6.3 %7.0 %8.6 %
2020 grants (2)6.7 %7.9 %8.7 %
2019 grants4.7 %5.8 %7.0 %
_______________________________
(1)Threshold performance for the 2021 grants and 2020 grants will earn 50% of the target number of PSUs. Threshold performance for the 2019 grants is 35% of the target number of PSUs.
(2)The performance levels for 2020 grants were modified by the compensation committee of the board of directors in the first quarter of 2021 to adjust for the sale of the Life Sciences business and the ongoing effects of the COVID-19 pandemic. Threshold Performance was changed to 6.7% to earn 50% of Shares, Target Performance was changed to 7.9% to earn 100% of Shares, and Maximum Performance was changed to 8.7% to earn 150% of Shares.
Schedule of Number of Awards Granted and Grant Date Fair Value of Each Award in Periods
The following table presents the number of PSUs granted and the grant-date fair value of each award in the periods presented.
 TSR AwardsROIC Awards
Award YearShares
(in thousands)		Grant-Date
Fair Value
(per share)		Shares
(in thousands)		Grant-Date
Fair Value
(per share)
2021142 $8.58 172 $7.20 
2020139 $10.88 157 $9.44 
2019136 $9.28 174 $7.93 
Summary of Status of Unvested PSU Awards
The following table presents the status of unvested PSUs as of December 31, 2021, and changes during the year then ended.
 Nonvested TSR AwardsNonvested ROIC Awards
 Number of
Shares
(in thousands)		Weighted
Average
Grant-Date
Fair Value		Number of
Shares
(in thousands)		Weighted
Average
Grant-Date
Fair Value
Nonvested at January 1, 2021138 $10.58 160 $9.13 
Granted142 8.58 172 7.20 
Forfeited(61)9.61 (71)8.17 
Expired(25)9.28 (33)7.93 
Nonvested at December 31, 2021194 $9.59 228 $8.14