Quarterly report pursuant to Section 13 or 15(d)

Financial Instruments And Risk Management (Narrative) (Details)

v3.2.0.727
Financial Instruments And Risk Management (Narrative) (Details) - Jun. 30, 2015 - USD ($)
Total
Derivative [Line Items]  
Deferred net gains on derivatives accumulated in other comprehensive income expected reclassification to net income in next twelve months $ 12,911,000
Maximum [Member]  
Derivative [Line Items]  
Derivatives maximum remaining maturity 2 years
Aggregate unrealized gain of derivative contracts with single counterparty $ 3,000,000