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Consolidated Statement of Cash Flows (Changes in Other Components of Working Capital) (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Consolidated Statement of Cash Flows [Abstract] |  |  |
Accounts receivable | $ (57,609) | $ (269,900) | $ 4,734
Costs and estimated earnings in excess of billings | (100,932) | 73,349 | (178,774)
Other current assets | (19,718) | 39,480 | (38,616)
Accounts payable | (32,225) | 56,552 | 139,290
Billings in excess of costs and estimated earnings | 125,757 | 42,926 | (30,985)
Accrued expenses | 24,513 | (32,937) | (24,426)
Changes in other components of working capital | (60,214) | (90,530) | (128,777)
Interest | 50,443 | 47,403 | 45,055
Income taxes | $ 39,776 | $ 26,908 | $ 35,299

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- Definition The amount of cash paid during the current period to foreign, federal, state, and local authorities as taxes on income, net of any cash received during the current period as refunds for the overpayment of taxes. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=98513485&loc=d3e4297-108586 + Details
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- Definition The increase (decrease) during the reporting period in the aggregate amount of liabilities incurred (and for which invoices have typically been received) and payable to vendors for goods and services received that are used in an entity's business. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585 + Details
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- Definition The increase (decrease) during the reporting period in amount due within one year (or one business cycle) from customers for the credit sale of goods and services. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585 + Details
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