Annual report pursuant to Section 13 and 15(d)

Deferred Charges, Goodwill And Other Assets, Net (Narrative) (Details)

v3.10.0.1
Deferred Charges, Goodwill And Other Assets, Net (Narrative) (Details) - USD ($)
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Credit Risk Contract [Member]      
Derivative Instruments, Gain (Loss) [Line Items]      
Net liability $ 0    
Designated as Hedging Instrument [Member] | Cash Flow Hedging [Member]      
Derivative Instruments, Gain (Loss) [Line Items]      
Derivative notional amount 675,000,000    
Ineffective gain (loss) in interest expense (200,000) $ (37,000) $ 600,000
Estimated additional amount to be reclassified to interest expense $ 6,700,000    
Not Designated as Hedging Instrument [Member] | Cash Flow Hedging [Member]      
Derivative Instruments, Gain (Loss) [Line Items]      
Amount of increase in the fair value of derivatives     $ 2,000