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

 
139,535

 
36.18

Performance condition adjustment
27,438

 
30.32

 
—

 
—

Vested
(69,066
)
 
30.25

 
(19,855
)
 
30.41

Forfeited
(8,839
)
 
32.64

 
(7,074
)
 
33.81

Outstanding, June 30, 2015
182,417

 
$
33.55

 
177,470

 
$
34.83
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
June 30
 
Six Months Ended
June 30
 
2015
 
2014
 
2015
 
2014
 
(thousands)
PSUs
$
720

 
$
683

 
$
1,214

 
$
1,050

RSUs
841

 
602

 
1,403

 
884

Stock options
132

 
183

 
281

 
376

Total
$
1,693

 
$
1,468

 
$
2,898

 
$
2,310