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Stock-Based Compensation (Tables)
3 Months Ended
Mar. 31, 2013
Share-based Compensation [Abstract]  
Schedule of stock-based compensation awards
The Company made the following stock-based compensation awards in the periods indicated: 
Stock-Based Compensation
Three Months Ended March 31,
(Amounts in thousands)
2013
 
2012
SARs granted (number of shares)
645

 
567

RSUs granted (number of shares)
131

 
115

Aggregate fair value at time of grant; SARs
$
4,231

 
$
4,509

Aggregate fair value at time of grant; RSUs
$
1,813

 
$
1,825

Assumptions used to estimate fair value of SARs issued
The following assumptions were used to estimate the fair value of SARs in the three months ended March 31, 2013 and 2012: 
Assumptions Used
2013
 
2012
Estimated average life
6 years
 
6 years
Risk-free interest rate
1.1%
 
1.1%-1.2%
Expected volatility
49.6%
 
49.6%
Weighted average volatility
49.6%
 
49.6%
Dividend yield
0.0%
 
0.0%
Weighted average exercise price
$13.81
 
$16.74
Weighted average grant date fair value
$6.56
 
$7.95