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Supplemental Cash Flow Information (Tables) | 12 Months Ended
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Dec. 31, 2021
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) | 2021 | 2020 | 2019
(Increase) decrease in: |  |  |
Accounts and notes receivable, net | $ | 5,393 |  | $ | 138,388 |  | $ | 210,419 |
Contract assets | (178,632) |  | 280,360 |  | 207,467 |
Other current assets | (167,416) |  | 3,893 |  | (80,248) |
Other assets | 283,895 |  | 76,613 |  | 44,707 |
Increase (decrease) in: |  |  |
Accounts payable | 6,360 |  | (343,113) |  | (46,873) |
Contract liabilities | (175,812) |  | (53,580) |  | 202,359 |
Accrued liabilities | 108,896 |  | (11,829) |  | 29,880 |
Other liabilities | (79,336) |  | (59,684) |  | 63,986 |
Increase (decrease) in cash due to changes in assets and liabilities | $ | (196,652) |  | $ | 31,048 |  | $ | 631,697 |
Cash paid during the year for: |  |  |
Interest | $ | 90,299 |  | $ | 65,641 |  | $ | 71,938 |
Income taxes (net of refunds) | 74,589 |  | 65,188 |  | 204,080 |
Our cash flow information for 2021, 2020 and 2019 included the following activities related to Disc Ops:
|  | Year Ended December 31,
(in thousands) |  | 2021 |  | 2020 |  | 2019
|  | Stork | AMECO | Total |  | Stork | AMECO | Total |  | Stork | AMECO | Total
Impairment expense |  | $ | 193,200 |  | $ | 53,085 |  | $ | 246,285 |  |  | $ | 195,239 |  | $ | 145,700 |  | $ | 340,939 |  |  | $ | 64,335 |  | $ | 32,428 |  | $ | 96,763 |
Depreciation of fixed assets |  | 5,417 |  | — |  | 5,417 |  |  | 21,849 |  | — |  | 21,849 |  |  | 24,203 |  | 54,568 |  | 78,771 |
Amortization of stock-based awards |  | — |  | — |  | — |  |  | — |  | 56 |  | 56 |  |  | — |  | 123 |  | 123 |
Capital expenditures |  | (16,861) |  | (11,019) |  | (27,880) |  |  | (21,087) |  | (26,913) |  | (48,000) |  |  | (28,185) |  | (73,433) |  | (101,618) |

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