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Business Risks and Commitments (Details 4) (USD $)
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Operating Leases:      
Consolidated rent expense $ 3,098,000 $ 2,900,000 $ 3,437,000
Future minimum payments under long-term non-cancelable operating leases      
2013 2,973,000    
2014 2,012,000    
2015 936,000    
2016 827,000    
2017 688,000    
Thereafter 1,589,000    
Total $ 9,025,000