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Commitments and Contingencies (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Future minimum lease payments required under non-cancelable operating leases      
2013 $ 11,532    
2014 9,605    
2015 7,309    
2016 4,658    
2017 2,661    
Thereafter 5,252    
Total 41,017    
Total lease expense 10,684 9,530 9,856
Lease payments to related party 1,342 1,278 1,151
Real Property
     
Future minimum lease payments required under non-cancelable operating leases      
2013 2,728    
2014 2,001    
2015 1,829    
2016 1,465    
2017 1,392    
Thereafter 2,944    
Total 12,359    
Real Property (Related Party)
     
Future minimum lease payments required under non-cancelable operating leases      
2013 1,597    
2014 1,563    
2015 941    
2016 775    
2017 786    
Thereafter 2,308    
Total 7,970    
Equipment
     
Future minimum lease payments required under non-cancelable operating leases      
2013 7,207    
2014 6,041    
2015 4,539    
2016 2,418    
2017 483    
Total $ 20,688