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Consolidated Statement of Cash Flows (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 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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