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Commitments and Contingencies Narrative (Details) (USD $) | 12 Months Ended |  | 12 Months Ended |  |  |  |  | 1 Months Ended |
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Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2012 Headquarters | Dec. 31, 2012 McCook facility | Dec. 31, 2011 McCook facility | Dec. 31, 2012 Capital leases | Dec. 31, 2011 Capital leases | Dec. 31, 2012 Potential payment default by third party | Jan. 31, 2012 Employment tax issue | Dec. 31, 2012 Employment tax issue
Commitments And Contingencies Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Amortization period of deferred gain |  |  |  |  |  | 10 years |  |  |  |  |  |
Total rental expense | $ 2,500,000 |  | $ 800,000 | $ 1,400,000 |  |  |  |  |  |  |  |
Total future minimum operating lease payments | 14,190,000 |  |  |  | 11,400,000 |  |  |  |  |  |  |
Length of build-to-suit lease |  |  |  |  |  | 10 years |  |  |  |  |  |
Total future minimum financing lease payments | 229,000 |  |  |  |  |  |  |  |  |  |  |
Property, plant and equipment, gross | 108,853,000 |  | 126,391,000 |  |  | 12,961,000 | 0 | 1,694,000 | 3,501,000 |  |  |
Accumulated depreciation and amortization | 41,698,000 |  | 73,689,000 |  |  | 700,000 |  | 1,500,000 |  |  |  |
Total future minimum lease payments of McCook facility | 12,116,000 | [1] |  |  |  |  |  |  |  |  |  |
Proposed adjustment including penalties |  |  |  |  |  |  |  |  |  |  | 9,500,000 |
Estimate of potential liability |  |  |  |  |  |  |  |  |  |  |  | 1,200,000
Possible net exposure, minimum |  |  |  |  |  |  |  |  |  | 0 |  |
Possible net exposure, maximum |  |  |  |  |  |  |  |  |  | $ 1.0 |  |
[1] | Relates to the McCook, Illinois distribution center lease.

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