Quarterly report pursuant to Section 13 or 15(d)

Financial Instruments And Risk Management (Narrative) (Details)

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Financial Instruments And Risk Management (Narrative) (Details)
9 Months Ended
Sep. 30, 2015
USD ($)
Derivative [Line Items]  
Deferred net gains on derivatives accumulated in other comprehensive income expected reclassification to net income in next twelve months $ 4,712,000
Maximum [Member]  
Derivative [Line Items]  
Derivatives maximum remaining maturity 2 years
Aggregate unrealized gain of derivative contracts with single counterparty $ 2,000,000