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Share-based Compensation (Tables)
 12 Months Ended
Dec. 31, 2021
Share-based Payment Arrangement [Abstract]  
Stock Option Activity
The number of stock options and weighted-average exercise prices as of December 31, 2021 and 2020 are as follows:
20212020
AwardsWeighted-Average Exercise PriceAwardsWeighted-Average Exercise Price
(awards in thousands)
Outstanding at beginning of period61 $48.19 97 $52.53 
Exercised(29)40.53 (28)57.79 
Forfeited— — (8)68.45 
Outstanding at end of the period32 $54.98 61 $48.19 
Exercisable at end of the period23 $49.50 44 $39.98 
Restricted Stock Activity A summary of outstanding restricted stock activity as of December 31, 2021 and 2020 are as follows:
20212020
SharesWeighted-Average Grant Date Fair ValueSharesWeighted-Average Grant Date Fair Value
(shares in thousands)
Outstanding at beginning of period50 $116.06 46 $98.28 
Granted22 264.58 43 113.87 
Vested(26)116.68 (32)88.71 
Forfeited(3)169.47 (7)108.86 
Outstanding at end of the period43 $183.51 50 $116.06 
Disclosure of Share-based Compensation Arrangements by Share-based Payment Award The total expenses during the years ended December 31, 2021, 2020 and 2019 are as follows (in thousands):
202120202019
SharesShare-Based Compensation ExpenseSharesShare-Based Compensation ExpenseSharesShare-Based Compensation Expense
Options and restricted stock75 $4,302 111 $3,493 143 $3,817 
Performance-based share awards granted in 202115 1,986 — — — — 
Performance-based share awards granted in 202026 1,807 28 1,662 — — 
Performance-based share awards granted in 2019— 1,808 17 1,641 18 703 
Total share-based compensation116 $9,903 156 $6,796 161 $4,520