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Property, Plant and Equipment (Details) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2013
Dec. 31, 2012
Dec. 31, 2011
Jun. 30, 2013
Southeast Operations
Dec. 30, 2012
Southeast Operations
Dec. 31, 2011
Southeast Operations
Property, Plant and Equipment            
Land and improvements       $ 896 $ 896 $ 896
Buildings 88,818 88,129 84,510 2,753 2,753 2,753
Machinery and equipment 271,166 264,084 253,933 46,470 46,369 42,564
Office furniture, fixtures and computers       351 351 263
Construction in-progress 9,928 11,176 5,812 3,277 795 0
Property and equipment, gross 525,589 514,434 486,718 53,747 51,164 46,476
Accumulated depreciation 264,280 248,510 220,262 43,286 41,620 38,386
Property and equipment, net $ 261,309 $ 265,924 $ 266,456 $ 10,461 $ 9,544 $ 8,090