Annual report pursuant to Section 13 and 15(d)

Financial Instruments and Risk Management (Narrative) (Details)

v3.20.4
Financial Instruments and Risk Management (Narrative) (Details)
12 Months Ended
Dec. 31, 2020
USD ($)
Derivatives [Line Items]  
Deferred net gains on derivatives accumulated in other comprehensive income expected to be reclassified to net income in next twelve months $ (4,300,000)
Maximum  
Derivatives [Line Items]  
Remaining maturity of derivative contracts 4 years
Aggregate unrealized gain of derivative contracts with single counterparty $ 1,400,000