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Financial Instruments And Risk Management (Narrative) (Details) | 6 Months Ended
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Jun. 30, 2019 USD ($)
Derivative [Line Items] |
Deferred net gains on derivatives accumulated in other comprehensive income expected reclassification to net income in next twelve months | $ 10,600,000
Derivatives maximum remaining maturity | 4 years
Maximum [Member] |
Derivative [Line Items] |
Aggregate unrealized gain of derivative contracts with single counterparty | $ 5,000,000.0

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- Definition Period remaining until the derivative contract matures, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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- Definition This item represents disclosure of all significant concentrations of credit risk or market risk arising from the subject financial instrument (as defined), whether from an individual counterparty or groups of counterparties. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 23 -URI http://asc.fasb.org/extlink&oid=118260190&loc=d3e13587-108611 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 21 -URI http://asc.fasb.org/extlink&oid=118260190&loc=d3e13537-108611 + Details
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