XML 31 R23.htm IDEA: XBRL DOCUMENT v2.4.0.6
Stock-Based Compensation (Details) (USD $)
 9 Months Ended 1 Months Ended 9 Months Ended
Sep. 30, 2012
item
Sep. 30, 2011
Sep. 30, 2012
LTIP
Mar. 31, 2012
Restricted Stock
Sep. 30, 2012
Restricted Stock
Sep. 30, 2012
Performance Awards
Options            
Outstanding at the beginning of the period (in shares) 1,514,884          
Granted (in shares) 169,088          
Exercised (in shares) (144,265)          
Forfeited (in shares) (4,680)          
Expired (in shares) (1,549)          
Outstanding at the end of the period (in shares) 1,533,478          
Weighted-Average Exercise Price            
Outstanding at the beginning of the period (in dollars per share) $ 8.82          
Granted (in dollars per share) $ 17.76          
Exercised (in dollars per share) $ 6.74          
Forfeited (in dollars per share) $ 19.19          
Expired (in dollars per share) $ 18.13          
Outstanding at the end of the period (in dollars per share) $ 9.96          
Aggregate Intrinsic Value            
Total intrinsic value of options exercised (in dollars) $ 1,727,000          
Outstanding at the end of the period (in dollars) 15,693,000          
Shares            
Outstanding at the beginning of the period (in shares)         106,838 74,435
Granted (in shares)         106,289 41,755
Vested (in shares)       (25,248) (25,248)  
Forfeited (in shares)         (2,115) (1,011)
Outstanding at the end of the period (in shares)         185,764 115,179
Weighted-Average Grant Date Fair Value            
Outstanding at the beginning of the period (in dollars per share)         $ 21.47 $ 20.39
Granted (in dollars per share)         $ 17.95 $ 17.48
Vested (in dollars per share)         $ 21.07  
Forfeited (in dollars per share)         $ 18.91 $ 19.76
Outstanding at the end of the period (in dollars per share)         $ 19.54 $ 19.34
Share-based compensation arrangements, number of plans 2          
Shares vested from prior grant       25,248 25,248  
Shares received as payment for withholding taxes due by holders of awards       6,186    
Stock-based compensation expense recognized (in dollars) 2,000,000 1,600,000        
Total unrecognized stock-based compensation cost, net of estimated forfeitures (in dollars)     $ 5,800,000