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Summary of Significant Accounting Policies (Details) (USD $)
 12 Months Ended 6 Months Ended 12 Months Ended 6 Months Ended 12 Months Ended 6 Months Ended 12 Months Ended 6 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Jun. 30, 2013
Jun. 30, 2012
Dec. 31, 2010
Dec. 31, 2009
Jun. 30, 2013
Combined accounts receivable
Credit concentration
Dec. 31, 2012
Combined accounts receivable
Credit concentration
Dec. 31, 2011
Combined accounts receivable
Credit concentration
Dec. 31, 2012
Minimum
Buildings
Dec. 31, 2012
Minimum
Machinery and equipment
Dec. 31, 2012
Maximum
Buildings
Dec. 31, 2012
Maximum
Machinery and equipment
Jun. 30, 2013
Southeast Operations
Dec. 30, 2012
Southeast Operations
Dec. 31, 2011
Southeast Operations
Jul. 01, 2012
Southeast Operations
Jun. 30, 2013
Southeast Operations
Buildings
Jun. 30, 2013
Southeast Operations
Machinery and equipment
Jun. 30, 2013
Southeast Operations
Office furniture and fixtures
Jun. 30, 2013
Southeast Operations
Computer equipment
Jun. 30, 2013
Southeast Operations
Combined accounts receivable
Credit concentration
item
Dec. 30, 2012
Southeast Operations
Combined accounts receivable
Credit concentration
item
Dec. 31, 2011
Southeast Operations
Combined accounts receivable
Credit concentration
item
Dec. 30, 2012
Southeast Operations
Minimum
Dec. 30, 2012
Southeast Operations
Maximum
Jun. 30, 2013
Southeast Operations
Maximum
Land improvements
Fiscal Accounting Year                                                      
Number of weeks in fiscal year                                                 364 days 371 days  
Cash and Cash Equivalents                                                      
Cash and cash equivalents $ 54,507,000 $ 182,455,000 $ 232,667,000 $ 174,075,000 $ 264,601,000 $ 287,101,000               $ 0 $ 0 $ 0 $ 0                    
Trade Accounts Receivable                                                      
Bad debt expense                           30,000 200,000                        
Trade Receivables, allowances 2,696,000 2,142,000 2,546,000                     600,000 700,000 500,000                      
Number of customers                                           1 1 0      
Concentration of credit risk 11.00% 10.00%         16.00% 14.00% 14.00%                         20.00% 25.00% 10.00%      
Property, Plant and Equipment                                                      
Property, Plant and Equipment, Useful Life                                   25 years 7 years 7 years 3 years           20 years
Property, Plant and Equipment, Useful Life                   20 7 40 12 Shorter of 20 years or the remaining lease term                          
Income Taxes                                                      
Provision for federal income taxes                           0 0 0                      
Provision for state income taxes                           $ 0 $ 0 $ 0