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Stock-Based Compensation (Tables)
 9 Months Ended
Sep. 30, 2019
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, 2019:
 
PSUs
 
RSUs
 
Number of shares
 
Weighted Average Grant-Date Fair Value
 
Number of shares
 
Weighted Average Grant-Date Fair Value
Outstanding, December 31, 2018
429,788

 
$
25.90

 
289,173

 
$
29.52

Granted
110,923

 
29.48

 
166,675

 
29.06

Performance condition adjustment, net (a)
1,443

 
43.05

 
—

 
—

Vested
(223,840
)
 
19.97

 
(183,403
)
 
26.44

Forfeited
(19,813
)
 
35.85

 
(13,321
)
 
35.23

Outstanding, September 30, 2019
298,501

 
$
31.09

 
259,124

 
$
31.11

_______________________________ 
(a)
Represents additional PSUs granted to non-officers based on achievement of 2018 EBITDA in excess of target.
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
 
2019
 
2018
 
2019
 
2018
 
(thousands)
PSUs
$
800

 
$
945

 
$
2,515

 
$
3,263

RSUs
1,147

 
1,217

 
3,501

 
3,630

Total
$
1,947

 
$
2,162

 
$
6,016

 
$
6,893