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Share-Based Compensation (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Share-based compensation      
Total compensation expense $ 5,972 $ 2,947 $ 1,855
Income tax benefits 1,729 752 226
Performance share units
     
Share-based compensation      
Stock options vesting period 3 years    
Total compensation expense 3,658 1,161  
Compensation expense to be recognized 4,414    
Weighted-average period over which unrecognized share-based compensation costs will be recognized in earnings 1 year 4 months 24 days    
Status of, and changes in, the Performance Share Unit Plan units granted to employees      
Outstanding at the beginning of the period (in shares) 163,708    
Granted (in shares) 211,600    
Outstanding at the end of the period (in shares) 375,308 163,708  
Vested and expected to vest 375,308    
Lifeco | Option
     
Share-based compensation      
Period preceding the date of the grant, to determine exercise price of options granted 5 days    
Expiration term 10 years    
Maximum period that retiring option holders can continue to vest outstanding options. 5 years    
Total compensation expense 2,314 1,786 1,855
Compensation expense to be recognized 3,016    
Compensation expense to be recognized 2,566    
Weighted-average period over which unrecognized share-based compensation costs will be recognized in earnings 1 year 8 months 12 days    
Shares under option      
Outstanding at the beginning of the period (in shares) 2,896,560    
Granted (in shares) 739,600    
Exercised (in shares) (354,000)    
Outstanding at the end of the period (in shares) 3,282,160 2,896,560  
Vested and expected to vest at the end of the period (in shares) 3,261,022    
Exercisable at the end of the period (in shares) 1,483,080    
Exercise price (Whole dollars)      
Outstanding at the beginning of the period (in dollars per share) $ 28.01    
Granted (in dollars per share) $ 23.28    
Exercised (in dollars per share) $ 19.43    
Outstanding at the end of the period (in dollars per share) $ 28.42 $ 28.01  
Vested and expected to vest at the end of the period (in dollars per share) $ 28.42    
Exercisable at the end of the period (in dollars per share) $ 30.10    
Remaining contractual term      
Outstanding at the end of the period 6 years 2 months 12 days    
Vested and expected to vest at the end of the period 6 years 2 months 12 days    
Exercisable at the end of the period 4 years 4 months 24 days    
Aggregate intrinsic value      
Outstanding at the end of the period 1,518    
Vested and expected to vest at the end of the period 1,168    
Exercisable at the end of the period 171    
Other information      
Weighted average fair value of options granted (in dollars per share) $ 3.47 $ 4.49 $ 4.41
Intrinsic value of options exercised 1,397 1,197 5,218
Fair value of options vested $ 1,740 $ 1,541 $ 943
Weighted-average assumptions      
Dividend yield (as a percent) 5.31% 4.59% 4.53%
Expected volatility (as a percent) 25.65% 25.22% 25.03%
Risk free interest rate (as a percent) 1.52% 2.62% 2.62%
Expected duration 6 years 5 years 6 months 5 years 6 months
Lifeco | Performance share units
     
Share-based compensation      
Number of shares considered for valuation of each stock award 1