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Stock-Based Compensation (Details 4) (Options and stock appreciation rights (SARs), USD $)
In Thousands, except Per Share data, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
Awards outstanding    
Number of awards outstanding (in shares) 927 913
Number of awards vested and exercisable (in shares) 681 681
Weighted average exercise price (in dollars per share) $ 23.21 $ 22.90
2013
   
Awards outstanding    
Number of awards outstanding (in shares) 87  
Number of awards vested and exercisable (in shares) 87  
Weighted average exercise price (in dollars per share) $ 20.17  
2014
   
Awards outstanding    
Number of awards outstanding (in shares) 132  
Number of awards vested and exercisable (in shares) 132  
Weighted average exercise price (in dollars per share) $ 22.70  
2015
   
Awards outstanding    
Number of awards outstanding (in shares) 1  
Number of awards vested and exercisable (in shares) 1  
Weighted average exercise price (in dollars per share) $ 20.90  
2016
   
Awards outstanding    
Number of awards outstanding (in shares) 157  
Number of awards vested and exercisable (in shares) 157  
Weighted average exercise price (in dollars per share) $ 24.07  
2017
   
Awards outstanding    
Number of awards outstanding (in shares) 125  
Number of awards vested and exercisable (in shares) 125  
Weighted average exercise price (in dollars per share) $ 26.81  
2018
   
Awards outstanding    
Number of awards outstanding (in shares) 92  
Number of awards vested and exercisable (in shares) 79  
Weighted average exercise price (in dollars per share) $ 23.37  
2019
   
Awards outstanding    
Number of awards outstanding (in shares) 89  
Number of awards vested and exercisable (in shares) 54  
Weighted average exercise price (in dollars per share) $ 22.15  
2020
   
Awards outstanding    
Number of awards outstanding (in shares) 82  
Number of awards vested and exercisable (in shares) 33  
Weighted average exercise price (in dollars per share) $ 21.03  
2021
   
Awards outstanding    
Number of awards outstanding (in shares) 64  
Number of awards vested and exercisable (in shares) 13  
Weighted average exercise price (in dollars per share) $ 23.78  
2022
   
Awards outstanding    
Number of awards outstanding (in shares) 98  
Weighted average exercise price (in dollars per share) $ 22.87