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Stock Compensation Plans (Tables)
 12 Months Ended
Dec. 31, 2013
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Valuation assumptions
The weighted-average estimated value of SPRs outstanding as of December 31, 2013 was $4.76 per SPR using the following assumptions:

Expected volatility
32.2% to 65.3%
Risk-free rate of return
0.1% to 1.9%
Expected term (in years)
0.7 to 5.2
Expected annual dividend
$0
Activity related to SPRs
Activity related to the Company’s SPRs during the year ended December 31, 2013 was as follows:
 
 
 
Weighted
 
Number
 
Average
 
of SPRs
 
Exercise Price
Outstanding on December 31, 2012
516,700

 
$
15.28

Granted
148,301

 
12.20

Cancelled
(45,732
)
 
15.58

Outstanding on December 31, 2013
619,269

 
14.48

 
 
 
 
Exercisable on December 31, 2013
258,050

 
$
21.17
Activity related to RSAs
Activity related to the Company’s RSAs during the year ended December 31, 2013 was as follows:
 
Restricted Stock
 
Awards
Outstanding on December 31, 2012
73,818

Granted
34,288

Exchanged for common shares
(56,169
)
Cancelled
(4,036
)
Outstanding on December 31, 2013
47,901
MSU Rollforward

Market Stock Units ("MSUs") are exchangeable for a certain amount 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.
 
Market Stock
 
Units
Outstanding on December 31, 2012
—

Granted
64,199

Cancelled
(5,200
)
Outstanding on December 31, 2013
58,999