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Capital Leases (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
Nov. 12, 2010
Rockford
Nov. 12, 2010
Rockford
Vehicles and equipment
Capital leases        
Fair value of assets acquired     $ 24,107 $ 12,501
Net book value of assets under capital leases 10,382 12,304    
Future minimum lease payments required under capital leases        
2013 3,921      
2014 2,736      
2015 1,141      
2016 105      
Total minimum lease payments 7,903      
Amounts representing interest (339)      
Net present value of minimum lease payments 7,564      
Less: current portion of capital lease obligations (3,733) (6,623)    
Long-term capital lease obligations $ 3,831 $ 4,047