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Leases (Details) (USD $)
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Leases [Abstract]      
Operating Leases, Rent Expense $ 19,400,000 $ 18,600,000 $ 18,200,000
Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract]      
2013 15,727,000    
2014 13,980,000    
2015 13,061,000    
2016 11,694,000    
2017 10,478,000    
Thereafter 61,104,000    
Total $ 126,044,000