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Stock-Based Compensation (Tables)
 9 Months Ended
Sep. 30, 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 nine months ended September 30, 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 52.45 101,059 52.95 
Performance condition adjustment (a)94,850 36.45 — — 
Vested(68,223)38.70 (106,200)35.64 
Forfeited(50,022)37.43 (46,325)34.07 
Outstanding, September 30, 2021246,210 $39.50 161,300 $45.08 
_______________________________ 
(a)    Represents additional PSUs granted during the nine months ended September 30, 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
September 30		Nine Months Ended
September 30
2021202020212020
(thousands)
PSUs$1,190 $1,503 $3,024 $2,804 
RSUs991 991 2,660 3,035 
Total$2,181 $2,494 $5,684 $5,839