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Stock-Based Compensation (Tables)
 9 Months Ended
Sep. 30, 2020
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, 2020September 30, 2019
 Number of
Awards		Weighted
average
grant-date
fair value		Number of
Awards		Weighted
average
grant-date
fair value
Outstanding at beginning of period963,832 $17.67 969,928 $15.89 
Granted437,054 18.85 302,596 23.22 
Converted(200,563)19.87 (164,864)17.48 
Expired(34,100)19.40 (7,500)23.78 
Forfeited(1,000)18.90 (6,000)23.73 
Outstanding at end of period1,165,223 $17.69 1,094,160 $17.58 
Vested353,023 $8.25 337,060 $8.04 
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, a risk-free interest rate of 0.7% and a volatility of 35.0% based on volatility over three years using daily stock prices.