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Consolidated Statement of Cash Flows (Tables) | 12 Months Ended
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Dec. 31, 2017
Consolidated Statement of Cash Flows |
Schedule of changes in operating assets and liabilities and cash paid for interest and income taxes (net of refunds) |
|  | Year Ended December 31,
(in thousands) |  | 2017 |  | 2016 |  | 2015 |
(Increase) decrease in: |  |  |  |  |  |  |
Accounts and notes receivable, net |  | $ | 162,655 |  | $ | (337,775 | ) | $ | 190,141 |
Contract work in progress |  | 140,556 |  | (72,419 | ) | 80,742 |
Other current assets |  | (138,638 | ) | 19,311 |  | (20,861 | )
Other assets |  | (3,944 | ) | 250,332 |  | (54,726 | )
Increase (decrease) in: |  |  |  |  |  |  |
Trade accounts payable |  | (137,441 | ) | 200,480 |  | (57,317 | )
Advance billings on contracts |  | 60,808 |  | 43,985 |  | 243,996 |
Accrued liabilities |  | (65,207 | ) | 40,088 |  | (38,529 | )
Other liabilities |  | (30,688 | ) | (8,609 | ) | (39,550 | )
Increase (decrease) in cash due to changes in operating assets and liabilities |  | $ | (11,899 | ) | $ | 135,393 |  | $ | 303,896 |
Cash paid during the year for: |  |  |  |  |  |  |
Interest |  | $ | 61,560 |  | $ | 72,057 |  | $ | 40,585 |
Income taxes (net of refunds) |  | 175,045 |  | 164,836 |  | 249,921 |

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