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Accounting Policies and Basis of Presentation (Details) (USD $) | 3 Months Ended | 1 Months Ended | 3 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | ---
Mar. 30, 2013 | Mar. 31, 2012 | Jan. 28, 2012 PS International | Mar. 31, 2012 PS International | Dec. 31, 2012 PS International | Jan. 02, 2012 PS International
Equity method investments |  |  |  |  |  |
Percentage ownership acquired |  |  |  |  |  | 50.00%
Ownership after increase (as a percent) |  |  | 70.00% |  | 85.00% |
Total cash paid, net of cash acquired |  | $ 2,825,000 | $ 2,825,000 | $ 2,825,000 |  |
Increase in working capital |  |  |  | 14,419,000 |  |
Increase in fixed assets |  |  |  | 163,000 |  |
Increase in goodwill |  |  |  | 2,590,000 |  |
Increase in intangible assets |  |  |  | 621,000 |  |
Increase in other long-term assets |  |  |  | 96,000 |  |
Increase in non-controlling interest |  |  |  | 5,649,000 |  |
Decrease in investments in and advances to affiliates |  |  |  | 9,415,000 |  |
Non-cash, pay-in-kind interest income and accretion of discount recognized on a note receivable from an affiliate | $ 3,111,000 | $ 2,818,000 |  |  |  |

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- Definition Percentage of voting equity interests acquired in the business combination. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=7659399&loc=d3e1392-128463 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 141R -Paragraph 68 -Subparagraph c -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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