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Financial Instruments and Risk Management (Narrative) (Details) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2018 USD ($) contract $ / bbl | Dec. 31, 2017 USD ($) bbl / d contract
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |
Number of foreign currency derivatives | contract | 0 | 0
Amount of loss reclassified to interest expense | $ 2,963 | $ 2,963
Amount of loss expected to be reclassified to interest expense in the next 12 months | 3,000 |
Loss deferred for fair value of interest rate derivative contracts, net of tax | 7,900 |
Income taxes on deferred loss on fair value of interest rate derivative contracts | $ 2,100 |
Commodity Derivative Contracts [Member] |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |
Daily production commitment (barrels per day) | bbl / d |  | 21,000
Average price | $ / bbl | 54.88 |

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