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Segment Reporting (Details Textual) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Segment Reporting Information [Line Items] |  |  |
Depreciation expense | $ 1,139,922 | $ 1,057,813 | $ 983,610
Acquisition payments | 0 | 9,972 | 1,858
Central support service assets depreciation expense allocated to other business segments |  |  |
Segment Reporting Information [Line Items] |  |  |
Depreciation expense | $ 22,000 | $ 21,000 | $ 14,000
Automotive industry | Supply Chain Solutions |  |  |
Segment Reporting Information [Line Items] |  |  |
Percentage of total revenue | 41.00% | 43.00% | 44.00%

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- Definition The amount of expense recognized in the current period that reflects the allocation of the cost of tangible assets over the assets' useful lives. Includes production and non-production related depreciation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 + Details
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