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Supplemental Cash Flow Information (Tables) | 12 Months Ended
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Dec. 31, 2020
Supplemental Cash Flow Information [Abstract] |
Consolidated statements of cash flows | The changes in assets and liabilities included in operating cash flow follow:
| Year Ended December 31,
(in thousands) | 2020 | 2019 | 2018
(Increase) decrease in: |  |  |
Accounts and notes receivable, net | $ | 138,388 |  | $ | 210,419 |  | $ | (40,632) |
Contract assets | 280,360 |  | 207,467 |  | (83,774) |
Other current assets | 3,893 |  | (80,248) |  | 168,021 |
Other assets | 109,405 |  | 100,527 |  | (25,424) |
Increase (decrease) in: |  |  |
Accounts payable | (343,113) |  | (46,873) |  | 176,335 |
Contract liabilities | (53,580) |  | 202,359 |  | (307,844) |
Accrued liabilities | (11,829) |  | 29,880 |  | (75,878) |
Other liabilities | (93,723) |  | 9,496 |  | (38,536) |
Increase (decrease) in cash due to changes in assets and liabilities | $ | 29,801 |  | $ | 633,027 |  | $ | (227,732) |
Cash paid during the year for: |  |  |
Interest | $ | 65,641 |  | $ | 71,938 |  | $ | 66,514 |
Income taxes (net of refunds) | 65,188 |  | 204,080 |  | (28,408) |
Our cash flow information for 2020, 2019 and 2018 included the following activities related to AMECO Disc Ops:
|  | Year Ended December 31,
(in thousands) |  | 2020 |  | 2019 | 2018
Impairment expense - Disc Ops |  | $ | 145,700 |  |  | $ | — |  |  | $ | — |
Depreciation of fixed assets |  | — |  |  | 44,295 |  |  | 72,137 |
Amortization of stock-based awards |  | 56 |  |  | 123 |  |  | 103 |
Capital expenditures |  | (23,430) |  |  | (68,048) |  |  | (40,856) |

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