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Stock-Based Compensation (Tables)
 9 Months Ended
Sep. 30, 2021
Share-based Payment Arrangement [Abstract]  
Schedule of Share-based Compensation, Equity Instruments Other Than Options, Activity The table below summarizes award activity.
 Nine Months Ended
 September 30, 2021September 30, 2020
 Number of
Awards		Weighted
average
grant-date
fair value		Number of
Awards		Weighted
average
grant-date
fair value
Outstanding at beginning of period1,085,023 $17.14 963,832 $17.67 
Granted273,845 26.65 437,054 18.85 
Converted(120,830)25.40 (200,563)19.87 
Expired(1,200)26.60 (34,100)19.40 
Forfeited(5,600)23.31 (1,000)18.90 
Outstanding at end of period1,231,238 $18.41 1,165,223 $17.69 
Vested357,499 $9.26 353,023 $8.25 
Schedule of Share-based Payment Award, Equity Instruments Other Than Options, Valuation Assumptions The market condition awards were valued using a Monte Carlo simulation technique based on volatility over three years for the awards granted in 2021 using daily stock prices and using the following variables:
2021
Risk-free interest rate0.3%
Volatility39.7%