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Share-Based Payments (Summary of Stock Option Transactions under our Share-Based Payment Plans) (Details) (USD $)
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Outstanding at December 31, 2011, number of shares 1,239,687    
Granted 2012, numbers of shares 0    
Exercised 2012, number of shares 118,012    
Forfeited or expired 2012, number of shares 24,921    
Outstanding at December 31, 2012, number of shares 1,096,754 1,239,687  
Exercisable at December 31, 2012, number of shares 1,062,409    
Outstanding at December 31, 2011, weighted average exercise price $ 18.78    
Granted 2012, weighted average exercise price $ 0.00    
Exercised 2012, weighted average exercise price $ 12.16    
Forfeited or expired 2012, weighted average exercise price $ 24.06    
Outstanding at December 31, 2012, weighted average exercise price $ 19.36 $ 18.78  
Exercisable as December 31, 2012, weighted average exercise price $ 19.48    
Outstanding at December 31, 2012, weighted average remaining contractual life in years 4 years 7 months 2 days    
Exercisable at December 31, 2012, weighted average remaining contractual life in years 4 years 6 months    
Outstanding at December 31, 2012, aggregate intrinsic value $ 2,598,000    
Exerciseable at December 31, 2012, aggregate intrinsic value 2,469,000    
Total intrinsic value of option exercised $ 800,000 $ 800,000 $ 800,000