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Stock-Based Compensation (Tables)
 6 Months Ended
Jun. 30, 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 six months ended June 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

 
166,180

 
29.06

Performance condition adjustment, net (a)
1,443

 
43.05

 
—

 
—

Vested
(223,706
)
 
19.97

 
(183,311
)
 
26.43

Forfeited
(19,545
)
 
35.97

 
(13,136
)
 
35.34

Outstanding, June 30, 2019
298,903

 
$
31.09

 
258,906

 
$
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
June 30
 
Six Months Ended
June 30
 
2019
 
2018
 
2019
 
2018
 
(thousands)
PSUs
$
736

 
$
1,231

 
$
1,715

 
$
2,318

RSUs
1,133

 
1,214

 
2,354

 
2,413

Total
$
1,869

 
$
2,445

 
$
4,069

 
$
4,731