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Financial Instruments and Risk Management (Narrative) (Details) bbl / d in Thousands, $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Mar. 31, 2018 USD ($) bbl / d contract item $ / bbl | Mar. 31, 2017 USD ($) bbl / d | Dec. 31, 2018 USD ($) | Dec. 31, 2017 item
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |
Number of foreign currency derivatives | contract | 0 |  |  |
Amount of loss reclassified to interest expense | $ 700 | $ 700 |  |
Derivative loss | $ 741 |  |  |
Number of offsetting positions | item | 0 |  |  | 0
Scenario, Forecast [Member] |  |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |
Derivative loss |  |  | $ 2,200 |
Commodity Derivative Contracts [Member] |  |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |
Daily production commitment (barrels per day) | bbl / d | 21 | 22 |  |
Average price | $ / bbl | 54.88 |  |  |
Foreign Exchange Derivative Contracts [Member] |  |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |
Fair value of foreign derivative contracts |  | $ 200 |  |
Foreign Exchange Derivative Contracts [Member] | Currency, U.S. Dollar [Member] |  |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |
Short-term derivative instruments |  | $ 18,500 |  |
Interest Rate Swap [Member] |  |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |
Loss deferred for fair value of interest rate derivative contracts, net of tax | $ 9,700 |  |  |
Income taxes on deferred loss on fair value of interest rate derivative contracts | $ 2,600 |  |  |
Notes Due 2022 [Member] |  |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |
Debt instrument term | 10 years |  |  |

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- Definition Fair value, before effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes liabilities elected not to be offset. Excludes liabilities not subject to a master netting arrangement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 20 -Section 50 -Paragraph 4D -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=82924980&loc=SL51823488-111719 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4B -Subparagraph (a),(c) -URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5624163-113959 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=82849420&loc=SL20226000-175313 + Details
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