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Financial Instruments (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Dec. 31, 2019
Derivative [Line Items]          
Cash Flow Hedge Gain (Loss) to be Reclassified within Twelve Months     $ 500    
Designated as Hedging Instrument [Member] | June 2019 4 YR Cross Currency Swap [Member]          
Derivative [Line Items]          
Line Of Credit Facility Forecasted Borrowing Amount $ 50,000   $ 50,000    
Derivative, Fixed Interest Rate 0.82%   0.82%    
Gain (Loss) on Foreign Currency Cash Flow Hedge Ineffectiveness $ 0   $ 0    
Designated as Hedging Instrument [Member] | June 2019 2 YR Cross Currency Swap [Member]          
Derivative [Line Items]          
Line Of Credit Facility Forecasted Borrowing Amount $ 50,000   $ 50,000    
Derivative, Fixed Interest Rate 0.95%   0.95%    
Gain (Loss) on Foreign Currency Cash Flow Hedge Ineffectiveness $ 0   $ 0    
Designated as Hedging Instrument [Member] | February 2019 Cross Currency Swap [Member]          
Derivative [Line Items]          
Line Of Credit Facility Forecasted Borrowing Amount $ 50,000   $ 50,000    
Derivative, Fixed Interest Rate 0.78%   0.78%    
Gain (Loss) on Foreign Currency Cash Flow Hedge Ineffectiveness $ 0   $ 0    
Designated as Hedging Instrument [Member] | 2017 Cross Currency Swap [Member]          
Derivative [Line Items]          
Gain (Loss) on Foreign Currency Cash Flow Hedge Ineffectiveness 0   0    
Designated as Hedging Instrument [Member] | 2.25% $100 Million Interest Rate Swap [Member]          
Derivative [Line Items]          
Line Of Credit Facility Forecasted Borrowing Amount $ 100,000   $ 100,000    
Derivative, Fixed Interest Rate 2.25%   2.25%    
Gain (Loss) on Interest Rate Cash Flow Hedge Ineffectiveness $ 0   $ 0    
Designated as Hedging Instrument [Member] | 2.52% $50 Million Interest Rate Swap [Member]          
Derivative [Line Items]          
Line Of Credit Facility Forecasted Borrowing Amount $ 50,000   $ 50,000    
Derivative, Fixed Interest Rate 2.52%   2.52%    
Gain (Loss) on Interest Rate Cash Flow Hedge Ineffectiveness $ 0   $ 0    
Not Designated as Hedging Instrument [Member]          
Derivative [Line Items]          
Gain (Loss) on Foreign Currency Derivative Instruments Not Designated as Hedging Instruments 300 $ 9,200 7,000 $ 4,500  
Derivative, Notional Amount $ 478,200   $ 478,200   $ 494,600