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Financial Instruments and Risk Management (Narrative) (Details) bbl / d in Thousands, $ in Millions | 6 Months Ended |
--- | --- | ---
Dec. 31, 2018 USD ($) | Jun. 30, 2018 USD ($) bbl / d contract item $ / bbl | Jun. 30, 2017 USD ($) bbl / d contract | Dec. 31, 2017 item
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |
Number of foreign currency derivatives | contract |  | 0 | 0 |
Amount of loss reclassified to interest expense |  | $ 1.5 | $ 1.5 |
Number of offsetting positions | item |  | 0 |  | 0
Scenario, Forecast [Member] |  |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |
Derivative loss | $ 1.5 |  |  |
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 |  |
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 |  | $ 9.1 |  |
Income taxes on deferred loss on fair value of interest rate derivative contracts |  | $ 2.4 |  |
Notes Due 2022 [Member] |  |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |
Debt instrument term |  | 10 years |  |

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