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Schedule of Changes in SARs (Details) (USD $)
9 Months Ended 12 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Dec. 31, 2012
Dec. 31, 2011
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.      
Stock Appreciation Rights (SARs)
       
Number of SARs        
Outstanding beginning of year, January 1, 118,832 50,471 50,471  
Awarded 87,078 68,361    
Outstanding at September 30, 205,910 118,832 118,832 50,471
Vested and expected to vest at September 30, 198,163 113,426    
Exercisable at September 30, 67,069 27,458    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price        
Outstanding beginning of year, January 1, $ 30.80 $ 31.61 $ 31.61  
Awarded $ 37.18 $ 30.19    
Outstanding at September 30, $ 33.50 $ 30.80 $ 30.80 $ 31.61
Vested and expected to vest at September 30, $ 33.41 $ 30.77    
Exercisable at September 30, $ 29.99 $ 28.84    
Weighted-Average Remaining Contractual Term (in years)        
Outstanding beginning of year, January 1, 8 years 4 months 16 days 8 years 8 months 30 days 8 years 4 months 7 days 8 years 7 months 6 days
Share-based Compensation Arrangement by Share-based Payment Award, Options, Awarded, Weighted Average Remaining Contractual Term   9 years 3 months 0 days    
Outstanding at September 30, 8 years 4 months 16 days 8 years 8 months 30 days 8 years 4 months 7 days 8 years 7 months 6 days
Vested and expected to vest at September 30, 8 years 4 months 7 days 8 years 8 months 30 days    
Exercisable at September 30, 7 years 3 months 21 days 7 years 9 months 0 days    
Share based compesation aggregate intrinsic value        
Outstanding beginning of year, January 1, $ 5,363,000 $ 328,000 $ 486,000 $ 341,000
Awarded 0 0    
Outstanding at September 30, 5,363,000 328,000 486,000 341,000
Vested and expected to vest at September 30, 5,178,000 319,000    
Exercisable at September 30, 1,982,000 153,000    
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized $ 2,000,000      
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized, Period for Recognition 2 years 0 months 0 days