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Stock Compensation - Restricted Stock and Performance Share Grants (Tables)
 12 Months Ended
Dec. 31, 2021
Share-based Payment Arrangement [Abstract]  
Summary of performance share grants with performance conditions
The following is a summary of the Company's performance share grants with performance conditions as of the year ended December 31, 2021:
Performance Share Grants with Performance Conditions
Threshold performance32,282 
Target performance515,919 
Maximum performance924,338 
Summary of stock grant activity
The following is a summary of the Company’s stock grant activity, both time and performance unit grants, assuming target achievement for outstanding performance grants for the following twelve-month periods ended:
December 31, 2021December 31, 2020December 31, 2019
Stock Grants Outstanding Beginning of the Year at Target Achievement840,307 409,373 538,599 
New Stock Grants/Additional shares due to achievement in excess of target63,622 797,364 160,471 
Vested Grants(196,328)(307,250)(188,032)
Expired/Forfeited Grants(23,956)(59,180)(101,665)
Stock Grants Outstanding at Target Achievement683,645 840,307 409,373 
Summary of assumptions used to determine the price of market-based performance condition grants
The following is a summary of the assumptions used to determine the price for the Company's market-based Performance Condition Grants for the year ended December 31, 2021:
($ in thousands except for share prices)
Grant dateDecember 12, 2019March 11, 2020December 11, 2020March 18, 2021
Vesting endDecember 31, 2022December 31, 2022December 31, 2023March 18, 2024
Share price at target achievement$18.80$16.36$17.07$20.02
Expected volatility17.28%18.21%29.25%30.30%
Risk-free interest rate1.69%0.58%0.19%0.33%
Simulated Monte Carlo share price$11.95$5.87$15.59$18.82
Shares granted6,32781,7163,62810,905
Total fair value of award$76$480$57$205
Summary of stock compensation costs for employee and NDSI plans
The following table summarizes stock compensation costs for the Company's 1998 Stock Incentive Plan, or the Employee 1998 Plan, and NDSI Plan for the following periods:
Employee 1998 Plan ($ in thousands):December 31, 2021December 31, 2020December 31, 2019
    Expensed$3,742 $4,060 $2,667 
    Capitalized460 1,135 760 
4,202 5,195 3,427 
NDSI Plan529 434 531 
$4,731 $5,629 $3,958