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Stock-Based Compensation (Tables)
 3 Months Ended
Mar. 31, 2020
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, 2020
 
March 31, 2019
 
Number of
Awards
 
Weighted
average
grant-date
fair value
 
Number of
Awards
 
Weighted
average
grant-date
fair value
Outstanding at beginning of period
963,832

 
$
17.67

 
969,928

 
$
15.89

Granted
435,254

 
18.86

 
276,496

 
23.24

Converted
(128,463
)
 
19.06

 
(130,764
)
 
16.74

Expired
(1,000
)
 
19.40

 
—

 
—

Forfeited
—

 
—

 
—

 
—

Outstanding at end of period
1,269,623

 
$
17.94

 
1,115,660

 
$
17.61

Vested
353,023

 
$
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.