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Stock-Based Compensation (Tables)
 9 Months Ended
Sep. 30, 2014
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
PSU and RSU Share Activity [Table Text Block]
The following summarizes the activity of our PSUs and RSUs awarded under the 2013 Incentive Plan for the nine months ended September 30, 2014:
 
PSUs
 
RSUs
 
Number of shares
 
Weighted Average Grant-Date Fair Value
 
Number of shares
 
Weighted Average Grant-Date Fair Value
Outstanding, December 31, 2013
90,124

 
$
26.65

 
14,161

 
$
26.65

Performance true-up
10,767

 
26.65

 
—

 
—

Vested
(55,619
)
 
26.65

 
(14,161
)
 
26.65

Granted
100,692

 
30.32

 
125,661

 
30.26

Forfeited
(7,968
)
 
28.93

 
(10,225
)
 
30.32

Outstanding, September 30, 2014
137,996

 
$
29.20

 
115,436

 
$
30.25
Stock Option Activity [Table Text Block]
The following is a summary of our stock option activity for the nine months ended September 30, 2014:
 
Number of Options
 
Weighted Average Exercise Price Per Option
 
Weighted Average Remaining Contractual Life
 
Aggregate Intrinsic Value
 
 
 
 
 
(years)
 
(thousands)
Outstanding, December 31, 2013
161,257

 
$
27.19

 

 

Exercised
(3,019
)
 
27.19

 
 
 
 
Cancelled/Forfeited
(11,627
)
 
27.19

 
 
 
 
Outstanding, September 30, 2014
146,611

 
$
27.19

 
8.4
 
$
433

Vested and expected to vest, September 30, 2014
135,996

 
$
27.19

 
8.4
 
$
401

Exercisable, September 30, 2014
50,107

 
$
27.19

 
8.4
 
$
148
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
September 30
 
Nine Months Ended
September 30
 
2014
 
2013
 
2014
 
2013
 
(thousands)
PSUs
$
1,152

 
$
511

 
$
2,202

 
$
1,205

RSUs
550

 
81

 
1,434

 
192

Stock options
174

 
197

 
550

 
465

Total
$
1,876

 
$
789

 
$
4,186

 
$
1,862