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Stock-Based Compensation (Tables)
 6 Months Ended
Jun. 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 six months ended June 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 99,588 52.96 
Performance condition adjustment (a)94,850 36.45 — — 
Vested(68,223)38.70 (106,200)35.64 
Forfeited(49,259)37.19 (45,562)33.76 
Outstanding, June 30, 2021246,973 $39.54 160,592 $45.06 
_______________________________ 
(a)    Represents additional PSUs granted during the six months ended June 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
June 30		Six Months Ended
June 30
2021202020212020
(thousands)
PSUs$745 $691 $1,834 $1,301 
RSUs666 980 1,669 2,044 
Total$1,411 $1,671 $3,503 $3,345