| Schedule of Disaggregation of revenue |
| | | | | | | | | | | | | | | | | | | Three Months Ended | | Six Months Ended | (in thousands) | | June 29, | | June 30, | | | | June 29, | | June 30, | | | Market Classification | | 2019 | | 2018 | | % Change | | 2019 | | 2018 | | % Change | FOB Shipping Point Revenue | | $ | 1,220,844 | | $ | 1,281,557 | | -4.7% | | $ | 2,217,667 | | $ | 2,263,248 | | -2.0% | Construction Contract Revenue | | | 43,663 | | | 38,811 | | 12.5% | | | 78,445 | | | 68,787 | | 14.0% | Total Gross Sales | | | 1,264,507 | | | 1,320,368 | | -4.2% | | | 2,296,112 | | | 2,332,035 | | -1.5% | Sales Allowances | | | (24,690) | | | (25,928) | | -4.8% | | | (41,169) | | | (43,738) | | -5.9% | Total Net Sales | | $ | 1,239,817 | | $ | 1,294,440 | | -4.2% | | $ | 2,254,943 | | $ | 2,288,297 | | -1.5% |
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| Schedule of percentage-of-completion balances |
The following table presents the balances of over time accounting accounts which are included in “Other current assets” and “Accrued liabilities: Other”, respectively (in thousands): | | | | | | | | | | | | | June 29, | | December 29, | | June 30, | | | | 2019 | | 2018 | | 2018 | | Cost and Earnings in Excess of Billings | | $ | 6,309 | | $ | 6,945 | | $ | 5,501 | | Billings in Excess of Cost and Earnings | | | 5,222 | | | 3,245 | | | 4,616 | |
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