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Financial Instruments and Risk Management (Narrative) (Details) $ in Thousands | 12 Months Ended
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Dec. 31, 2018 bbl / d $ / bbl | Dec. 31, 2017 USD ($) bbl / d | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($)
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |
Amount of loss reclassified to interest expense |  | $ 2,963 | $ 2,963 | $ 3,000
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 |  | 8,400 |  |
Income taxes on deferred loss on fair value of interest rate derivative contracts |  | $ 4,500 |  |
Commodity Derivative Contracts [Member] |  |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |
Daily production commitment (barrels per day) | bbl / d |  | 22,000 |  |
Fair value of derivative contract liability |  | $ 39,100 | 48,900 |
Increase (decrease) of income before taxes due to the impact of marking to market of derivative contracts |  | $ (34,000) | (47,700) |
Commodity Derivative Contracts [Member] | Scenario, Forecast [Member] |  |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |
Daily production commitment (barrels per day) | bbl / d | 21,000 |  |  |
Average price | $ / bbl | 54.88 |  |  |
Foreign Exchange Derivative Contracts [Member] | Currency, U.S. Dollar [Member] |  |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |
Short-term derivative instruments |  |  | $ 14,200 |

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- Definition Aggregate notional amount specified by the derivative(s). Expressed as an absolute value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 12 -Section 13 -Sentence Column B + Details
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- Definition Amount as of the balance sheet date of the unamortized adjustment to the carrying value of an interest-bearing hedged item made under an effective interest rate fair value hedge that is amortized upon discontinuation of the interest rate fair value hedge. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 25 -Section 35 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=82917030&loc=d3e75592-113984 + Details
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