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Stock Compensation - Restricted Stock and Performance Share Grants (Tables)
 9 Months Ended
Sep. 30, 2020
Share-based Payment Arrangement [Abstract]  
Summary of performance share grants with performance conditions
The following is a summary of the Company's Performance Condition Grants as of the nine months ended September 30, 2020:
Performance Condition Grants
Threshold performance67,713 
Target performance621,515 
Maximum performance1,063,367 
Summary of stock grant activity
The following is a summary of the Company’s stock grant activity, both time and performance share grants, assuming target achievement for outstanding performance grants for the nine months ended September 30, 2020:
September 30, 2020
Stock Grants Outstanding Beginning of Period at Target Achievement409,373 
New Stock Grants/Additional Shares due to Achievement in Excess of Target777,970 
Vested Grants(224,441)
Expired/Forfeited Grants— 
Stock Grants Outstanding End of Period at Target Achievement962,902 
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 nine months ended September 30, 2020:
($ in thousands except for share prices)
Grant dateDecember 12, 2019March 11, 2020
Vesting endDecember 31, 2022December 31, 2022
Share price at target achievement$18.80$16.36
Expected volatility17.28%18.21%
Risk-free interest rate1.69%0.58%
Simulated Monte Carlo share price$11.95$5.87
Shares granted6,32781,716
Total fair value of award$76$480
Summary of stock compensation costs for Employee and NDSI Plans
The following table summarizes stock compensation costs for the Company's 1998 Stock Incentive Plan, or the Employee Plan, and NDSI Plan for the following periods:
($ in thousands)Nine Months Ended September 30,
Employee Plan:20202019
    Expensed$3,239 $1,523 
    Capitalized926 520 
4,165 2,043 
NDSI Plan - Expensed327 407 
Total Stock Compensation Costs$4,492 $2,450