Annual report pursuant to Section 13 and 15(d)

Financial Instruments Financial Instruments - Additional Information (Details 4)

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Financial Instruments Financial Instruments - Additional Information (Details 4) - USD ($)
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Derivative Asset   $ 1,623,000 $ 734,000
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Gain (Loss) Included in Other Comprehensive Income (Loss) $ (1,660,000) 889,000 $ 700,000
Derivative Liability, Current (37,000)    
Fair Value, Liabilities, Transfers between Levels $ 0 $ 0