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Stock-Based Compensation (Tables)
 3 Months Ended
Mar. 31, 2021
Share-based Payment Arrangement [Abstract]  
Schedule of Nonvested Share Activity [Table Text Block] The following summarizes the activity of our PSUs and RSUs awarded under our incentive plan for the three months ended March 31, 2021:
PSUsRSUs
Number of sharesWeighted Average Grant-Date Fair ValueNumber of sharesWeighted Average Grant-Date Fair Value
Outstanding, December 31, 2020196,340 $35.34 212,766 $34.24 
Granted73,265 52.45 96,622 52.45 
Performance condition adjustment (a)94,850 36.45 — — 
Vested(68,223)38.70 (106,200)35.64 
Forfeited(11,775)34.89 (7,398)33.79 
Outstanding, March 31, 2021284,457 $39.33 195,790 $42.48 
_______________________________ 
(a)    Represents additional PSUs granted during the three months ended March 31, 2021, related to the 2020 performance condition adjustment described above.
Stock-Based Compensation Expense Recognized [Table Text Block] Total stock-based compensation recognized from PSUs and RSUs, net of forfeitures, was as follows:
Three Months Ended
March 31
20212020
(thousands)
PSUs$1,089 $610 
RSUs1,003 1,064 
Total$2,092 $1,674