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Stock-Based Compensation (Tables)
 3 Months Ended
Mar. 31, 2021
Share-based Payment Arrangement [Abstract]  
Schedule of Share-based Compensation, Equity Instruments Other Than Options, Activity The table below summarizes award activity.
 Three Months Ended
 March 31, 2021March 31, 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 
Granted274,606 26.65 435,254 18.86 
Converted(115,930)25.55 (128,463)19.06 
Expired— — (1,000)19.40 
Forfeited— — — — 
Outstanding at end of period1,243,699 $18.46 1,269,623 $17.94 
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%