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Borrowings (Bank Of America Credit Facility) (Narrative) (Details) - USD ($)
$ in Thousands
12 Months Ended
Mar. 06, 2020
Aug. 08, 2019
Mar. 05, 2019
Mar. 03, 2016
Dec. 31, 2019
Dec. 31, 2018
Debt Instrument [Line Items]            
Contractual facility         $ 283,138 $ 252,929
Bank Of America Credit Facility [Member]            
Debt Instrument [Line Items]            
Contractual facility       $ 55,000 $ 55,000 $ 55,000
Reduced leverage ratio       0.25%    
Earliest period subjected to repayment of borrowings       18 months    
Extension period   4 months 6 months      
Maturity date   Sep. 01, 2020 May 01, 2020   Mar. 06, 2023 May 01, 2020
Subsequent Event [Member] | Bank Of America Credit Facility [Member]            
Debt Instrument [Line Items]            
Contractual facility $ 55,000          
Maturity date Mar. 06, 2023          
Subsequent Event [Member] | Minimum [Member] | Bank Of America Credit Facility [Member]            
Debt Instrument [Line Items]            
Interest rate 2.50%          
Subsequent Event [Member] | Maximum [Member] | Bank Of America Credit Facility [Member]            
Debt Instrument [Line Items]            
Interest rate 3.00%