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Leases (Details) (USD $)
 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Dec. 30, 2012
Southeast Operations
Dec. 30, 2012
Southeast Operations
Equipment
Leases                  
Gross amount of equipment under capital leases                 $ 112,000
Accumulated depreciation                 (10,000)
Net amount of equipment under capital leases                 102,000
Minimum annual rental payments under the terms of capital leases                  
2013               55,000  
2014               24,000  
2015               5,000  
Thereafter               0  
Total minimum lease payments               84,000  
Less amounts representing interest               (4,000)  
Present value of net capital lease payments               80,000  
Minimum annual rental payments under the terms of operating leases                  
2013         12,346,000     120,000  
2014         11,613,000     115,000  
2015         10,919,000     90,000  
Thereafter               0  
Total         89,182,000     325,000  
Rental expense $ 3,700,000 $ 3,600,000 $ 7,300,000 $ 7,200,000 $ 14,300,000 $ 14,500,000 $ 14,200,000 $ 400,000