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Schedule of Changes in Restricted Stock - TIme Based Awards (Details) (USD $)
9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Share-based Compensation Arrangement by Share-based Payment Award    
Share-based Compensation Arrangement by Share-based Payment Award, Terms of Award The SARs vest ratably over a three-year period and may be exercised at any point after vesting through 10 years from the date of issuance. Pursuant to the terms of the awards, upon exercise, the executive officers will receive, in shares of common stock, the excess of the market price of the award on the date of exercise over the market price of the award on the date of issuance.  
Restricted stock
   
Share-based Compensation Arrangement by Share-based Payment Award    
Share-based Compensation Arrangement by Share-based Payment Award, Terms of Award The fair value of the time-based restricted shares is amortized ratably over the requisite service period, primarily three or four years. The time-based shares vest ratably on each annual anniversary following the grant date if the participant is continuously employed.  
Time based shares granted to executives 103,050  
Number of Shares    
Outstanding beginning of year, January 1, 646,490  
Granted 292,548  
Vested (265,312)  
Forfeited (22,507)  
Outstanding at September 30, 651,219  
Weighted-Average Grant-Date Fair Value    
Outstanding at beginning of year, January 1, $ 27.93  
Weighted-average grant date fair value per share $ 44.56 $ 26.48
Vested $ 27.53  
Forfeited $ 31.29  
Outstanding at September 30, $ 35.45  
Total intrinsic value of time based awards vested $ 12,562,000 $ 4,818,000
Total intrinsic value of time-based awards non-vested 38,774,000 21,996,000
Market price per common share as of September 30, $ 59.54 $ 31.63
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized $ 16,800,000  
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized, Period for Recognition 2 years 1 month 24 days