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Stock-based Compensation Plans (Tables)
 3 Months Ended
Mar. 31, 2013
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Schedule of share-based compensation, nonvested share, activity
The following table presents a summary of the Company’s stock-based compensation activity for the three months ended March 31, 2013 (in thousands):

 
STOCK OPTIONS
 
RESTRICTED STOCK AWARDS
 
PERFORMANCE-BASED SHARE UNITS (1)
Outstanding at December 31, 2012
12,379

 
299

 
—

Granted
1,282

 
219

 
52

Exercised or vested
(1,212
)
 
(3
)
 
—

Forfeited or expired
(243
)
 
(10
)
 
(4
)
Outstanding at March 31, 2013
12,206

 
505

 
48

________________
(1)
Share unit amounts represent the target number of PSUs considered granted for accounting recognition based on the establishment of performance targets for future years. The actual number of shares that will be earned upon vesting is dependent upon actual performance and may range from zero to 200% of the target number of shares.
Schedule of assumptions used to calculate fair value of options
The following assumptions were used to calculate the fair value of options granted for the periods indicated:

 
THREE MONTHS ENDED MARCH 31,
 
2013
 
2012
Weighted-average risk-free interest rate
1.09
%
 
1.15
%
Dividend yield
—
%
 
—
%
Expected term
6.3 years

 
6.5 years

Weighted-average volatility
48.6
%
 
55.5
%