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Stock-Based Compensation Plans Stock-Based Compensation Plans (Tables)
 12 Months Ended
Dec. 31, 2014
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Valuation assumptions
The weighted-average estimated value of SPRs outstanding as of December 31, 2014 was $14.96 per SPR using the following assumptions:

Expected volatility
31.8% to 43.8%
Risk-free rate of return
0.1% to 1.5%
Expected term (in years)
0.2 to 4.5
Expected annual dividend
$0
Activity related to SPRs
Activity related to the Company’s SPRs during the year ended December 31, 2014 was as follows:
 
Number of SPRs
 
Weighted Average Exercise Price
Outstanding on December 31, 2013
619,269

 
$
14.48

Granted
114,753

 
12.89

Exercised
(3,915
)
 
15.66

Cancelled
(85,416
)
 
11.86

Outstanding on December 31, 2014
644,691

 
14.50

 
 
 
 
Exercisable on December 31, 2014
342,700

 
$
18.16
Activity related to RSAs
Activity related to the Company’s RSAs during the year ended December 31, 2014 was as follows:
 
Restricted Stock Awards
Outstanding on December 31, 2013
47,901

Granted
37,123

Exchanged for shares
(45,231
)
Cancelled
(4,670
)
Outstanding on December 31, 2014
35,123
MSU Rollforward

Market Stock Units ("MSUs") are exchangeable for between 0% to 150% of the Company's common shares at the end of the vesting period based on the trailing thirty-day average closing price of the Company's common stock. Expense of $0.3 million and $0.2 million related to MSUs was recorded in the years ended December 31, 2014 and 2013, respectively. Activity related to the Company’s MSUs during the year ended December 31, 2014 was as follows:
 
Number of Market Stock Units
 
Maximum Shares Potentially Issuable
Outstanding on December 31, 2013
58,999

 
88,499

Granted
54,948

 
82,422

Exchanged for shares
(884
)
 
(1,326
)
Cancelled
(24,463
)
 
(36,695
)
Outstanding on December 31, 2014
88,600

 
132,900
Stock Option Activity Table
Stock Options

Each stock option can be exchanged for one share of the Company’s common stock. Activity related to the Company’s stock options during the year ended December 31, 2014 was as follows:
 
Number of Stock Options
 
Weighted Average Exercise Price
Outstanding on December 31, 2013
12,198

 
$
14.05

Exchanged for shares
(3,723
)
 
14.04

Cancelled
(2,565
)
 
14.09

Outstanding on December 31, 2014
5,910

 
14.04