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Unaudited Quarterly Financial Information (Tables) | 12 Months Ended
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Dec. 31, 2016
Quarterly Financial Information Disclosure [Abstract] |
Results of Operations for Each Quarter | Results of operations for each of the four quarters in the respective fiscal years are as follows. Each quarter during fiscal 2016 and fiscal 2015 represents a period of twelve weeks, except the first quarter, which includes sixteen weeks (amounts in thousands, except per share data):
|  |  |  | First Quarter |  |  | Second Quarter |  |  | Third Quarter |  |  | Fourth Quarter |
Sales |  | 2016 |  | $ | 1,204,352 |  |  | $ | 935,025 |  |  | $ | 918,791 |  |  | $ | 868,717 |
|  | 2015 |  | $ | 1,146,045 |  |  | $ | 888,795 |  |  | $ | 885,302 |  |  | $ | 858,363 |
Materials, supplies, labor and other production costs (exclusive of depreciation and amortization shown separately) |  | 2016 |  | $ | 621,190 |  |  | $ | 477,955 |  |  | $ | 476,760 |  |  | $ | 450,462 |
|  | 2015 |  | $ | 585,916 |  |  | $ | 457,253 |  |  | $ | 464,045 |  |  | $ | 455,939 |
Net income |  | 2016 |  | $ | 59,363 |  |  | $ | 51,155 |  |  | $ | 40,216 |  |  | $ | 13,042 |
|  | 2015 |  | $ | 61,389 |  |  | $ | 51,760 |  |  | $ | 43,796 |  |  | $ | 32,246 |
Basic net income per share |  | 2016 |  | $ | 0.28 |  |  | $ | 0.25 |  |  | $ | 0.19 |  |  | $ | 0.06 |
|  | 2015 |  | $ | 0.29 |  |  | $ | 0.25 |  |  | $ | 0.21 |  |  | $ | 0.15 |
Diluted net income per share |  | 2016 |  | $ | 0.28 |  |  | $ | 0.24 |  |  | $ | 0.19 |  |  | $ | 0.06 |
|  | 2015 |  | $ | 0.29 |  |  | $ | 0.24 |  |  | $ | 0.21 |  |  | $ | 0.15 |

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- Definition Tabular disclosure of quarterly financial data. Includes, but is not limited to, financial information for fiscal quarters, cumulative effect of a change in accounting principle and earnings per share data. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a)-(j) -URI http://asc.fasb.org/extlink&oid=68076893&loc=d3e1280-108306 + Details
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