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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
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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 |  |  |  |  |  |  |  |  |  |  |

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