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Stock-Based Compensation (Tables)
 3 Months Ended
Mar. 31, 2019
Disclosure of Compensation Related Costs, Share-based Payments [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, 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

 
165,350

 
29.08

Performance condition adjustment, net (a)
1,443

 
43.05

 
—

 
—

Vested
(212,891
)
 
19.45

 
(182,857
)
 
26.42

Forfeited
(10,512
)
 
37.99

 
(5,561
)
 
35.96

Outstanding, March 31, 2019
318,751

 
$
31.13

 
266,105

 
$
31.24

_______________________________ 
(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
March 31
 
2019
 
2018
 
(thousands)
PSUs
$
979

 
$
1,087

RSUs
1,221

 
1,199

Total
$
2,200

 
$
2,286