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Supplemental Cash Flow Information (Tables)
12 Months Ended
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)202020192018
(Increase) decrease in:
Accounts and notes receivable, net$138,388 $210,419 $(40,632)
Contract assets280,360 207,467 (83,774)
Other current assets3,893 (80,248)168,021 
Other assets109,405 100,527 (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)202020192018
Impairment expense - Disc Ops$145,700 $— $— 
Depreciation of fixed assets— 44,295 72,137 
Amortization of stock-based awards56 123 103 
Capital expenditures(23,430)(68,048)(40,856)