Annual report pursuant to Section 13 and 15(d)

Financial Instruments Financial Instruments - Additional Information (Details 4)

v3.20.4
Financial Instruments Financial Instruments - Additional Information (Details 4) - USD ($)
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Gain (Loss) Included in Other Comprehensive Income (Loss) $ 122,000 $ (1,660,000) $ 900,000
Derivative, Gain (Loss) on Derivative, Net (85,000) 0  
Derivative Liability, Current 0 (37,000) $ (1,623,000)
Fair Value, Liabilities, Transfers between Levels $ 0 $ 0