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Other Financial Information (Noncash Opearting Working Capital Increase (Decrease)) (Details) - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2018 | Mar. 31, 2017
Other Financial Information [Abstract] |  |
Decrease in accounts receivable | $ 30,467 | $ 36,246
Decrease in inventories | 12,189 | 4,497
Decrease (increase) in prepaid expenses | (5,031) | 17,788
Decrease in accounts payable and accrued liabilities | (25,270) | (44,240)
Increase in income taxes payable | 29,199 | 29,127
Net decrease in noncash operating working capital | 41,554 | 43,418
Cash income taxes paid, net of refunds | 7,940 | 3,422
Interest paid, net of amounts capitalized of $1,139 in 2018 and $1,093 in 2017 | 35,666 | 17,720
Asset retirement costs capitalized | 727 | 565
Decrease (increase) in capital expenditure accrual | (10,757) | 12,906
Interest paid, amounts capitalized | $ 1,139 | $ 1,093

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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 amounts payable to vendors for goods and services received and the amount of obligations and expenses incurred but not paid. + 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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