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v3.19.1

Financial Instruments and Risk Management (Narrative) (Details) | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Mar. 31, 2019 USD ($) bbl / d contract item | Mar. 31, 2018 USD ($) contract $ / bbl | Dec. 31, 2019 USD ($) | Dec. 31, 2018 item
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |
Number of foreign currency derivatives | contract | 0 | 0 |  |
Amount of loss reclassified to interest expense | $ 700,000 | $ 700,000 |  |
Number of offsetting positions | item | 0 |  |  | 0
Scenario, Forecast [Member] |  |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |
Derivative loss |  |  | $ 2,200,000 |
Commodity Derivative Contracts [Member] |  |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |
Daily production commitment (barrels per day) | 0 | 21,000 |  |
Average price | $ / bbl |  | 54.88 |  |
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 | $ 7,300,000 |  |  |
Income taxes on deferred loss on fair value of interest rate derivative contracts | $ 1,900,000 |  |  |
Notes Due 2022 [Member] |  |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |
Debt instrument term | 10 years |  |  |

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