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Related Party Transactions (Details) (USD $)
 1 Months Ended 12 Months Ended 1 Months Ended
Dec. 31, 2012
Aug. 31, 2011
May 31, 2011
Aug. 31, 2010
Dec. 31, 2012
Rent_Property
Lease_Property
Dec. 31, 2011
Dec. 31, 2010
Aug. 31, 2012
Trust [Member]
Aug. 31, 2012
Mckenna [Member]
Related Party Transaction [Line Items]                  
Purchase of common shares 7,408 12,000 29,842 32,687 50,334 52,392 32,687 30,410 4,100
Common shares price per share $ 54.71 $ 63.72 $ 69.21 $ 32.43       $ 54.92 $ 55.91
Number of trading days to be considered for average price of stock repurchased 30 days 30 days 30 days 30 days       30 days 30 days
Related Party Transactions (Textual) [Abstract]                  
Service expense         $ 700,000 $ 500,000 $ 200,000    
Compensation payment received           184,608      
Ryan Ruhlman employee years of service           6 years      
Compensation attributable to stock option           99,600      
Related party transactions number of property leased         2        
Related party transaction lease expenses         300,000 300,000 100,000    
Related party transactions number of property rented         2        
Rent Expenses         300,000 300,000 200,000    
Labor expense         700,000 700,000 600,000    
Maintenance and building expenses         $ 0 $ 200,000 $ 200,000    
Ownership percentage owned by related party         50.00%