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Segment Information - Summary of Unallocated Corporate Overhead (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 27, 2015 | Jun. 28, 2014 | Jun. 27, 2015 | Jun. 28, 2014
Segment Reporting Information [Line Items] |  |  |  |
Stock-based compensation expense | $ 10,199 | $ 8,222 | $ 19,873 | $ 14,881
Depreciation expense | 17,400 | 17,400 | 34,500 | 33,200
Unallocated corporate |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Stock-based compensation expense | 6,419 | 4,905 | 12,699 | 8,607
Salary, bonus and fringe | 7,234 | 7,438 | 17,930 | 17,705
Consulting, audit and professional services | 3,130 | 2,437 | 6,771 | 5,668
IT related expenses | 1,685 | 1,323 | 3,549 | 2,900
Depreciation expense | 1,779 | 1,874 | 3,677 | 3,713
Acquisition related adjustments | 3,956 | 1,371 | 3,594 | 4,676
Other general unallocated corporate expenses | 2,103 | 2,114 | 4,240 | 4,060
Total unallocated corporate overhead costs | $ 26,306 | $ 21,462 | $ 52,460 | $ 47,329

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- Definition Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 14.F) -URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 14 -Section F + Details
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