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Stock-Based Compensation (Tables)
 3 Months Ended
Mar. 31, 2020
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, 2020:
 
PSUs
 
RSUs
 
Number of shares
 
Weighted Average Grant-Date Fair Value
 
Number of shares
 
Weighted Average Grant-Date Fair Value
Outstanding, December 31, 2019
295,347

 
$
31.09

 
257,564

 
$
31.14

Granted
94,850

 
36.45

 
125,716

 
36.45

Performance condition adjustment (a)
(6,989
)
 
29.48

 
—

 
—

Vested
(162,622
)
 
28.93

 
(143,807
)
 
30.88

Forfeited
(24,246
)
 
32.57

 
(26,707
)
 
32.82

Outstanding, March 31, 2020
196,340

 
$
35.34

 
212,766

 
$
34.24

_______________________________ 
(a)
Represents total PSUs forfeited during the three months ended March 31, 2020 related to the 2019 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
 
2020
 
2019
 
(thousands)
PSUs
$
610

 
$
979

RSUs
1,064

 
1,221

Total
$
1,674

 
$
2,200