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Stock-Based Compensation (Tables)
 3 Months Ended
Mar. 31, 2015
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 the 2013 Incentive Plan for the three months ended March 31, 2015:
 
PSUs
 
RSUs
 
Number of shares
 
Weighted Average Grant-Date Fair Value
 
Number of shares
 
Weighted Average Grant-Date Fair Value
Outstanding, December 31, 2014
116,559

 
$
29.66

 
64,864

 
$
30.45

Granted
116,325

 
36.17

 
137,614

 
36.18

Performance condition adjustment
27,438

 
30.32

 
—

 
—

Vested
(64,149
)
 
30.32

 
(17,107
)
 
30.43

Forfeited
(1,428
)
 
29.79

 
(1,099
)
 
30.32

Outstanding, March 31, 2015
194,745

 
$
33.42

 
184,272

 
$
34.73
Stock-Based Compensation Expense Recognized [Table Text Block]
Total stock-based compensation recognized from PSUs, RSUs, and stock options net of estimated forfeitures, was as follows:
 
Three Months Ended
March 31
 
2015
 
2014
 
(thousands)
PSUs
$
494

 
$
367

RSUs
562

 
282

Stock options
149

 
193

Total
$
1,205

 
$
842