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Derivative Financial Instruments (Narrative) (Details) - Swap - FFL - USD ($)
$ in Millions
Feb. 13, 2014
Dec. 31, 2018
Jul. 31, 2018
Jan. 31, 2018
Derivative [Line Items]        
Term of swap agreement 1 year      
Derivative, notional amount   $ 100    
LIBOR        
Derivative [Line Items]        
Basis spread on variable rate 1.28%   1.05% 1.20%