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Stock-Based Compensation (Tables)
 6 Months Ended
Jun. 30, 2020
Share-based Payment Arrangement [Abstract]  
Schedule of Share-based Compensation, Equity Instruments Other Than Options, Activity The table below summarizes award activity.
 Six Months Ended
 June 30, 2020June 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  295,096  23.22  
Converted(200,563) 19.87  (153,464) 17.29  
Expired(34,100) 19.40  (5,600) 23.78  
Forfeited(1,000) 18.90  (2,600) 22.16  
Outstanding at end of period1,165,223  $17.69  1,103,360  $17.61  
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.