Quarterly report pursuant to Section 13 or 15(d)

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

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Deferred Charges, Goodwill And Other Assets, Net (Narrative) (Details) - USD ($)
 3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Credit Risk Contract [Member]        
Derivative Instruments, Gain (Loss) [Line Items]        
Net liability $ 4,000   $ 4,000  
Settlement obligation 4,000   4,000  
Designated as Hedging Instrument [Member] | Cash Flow Hedging [Member]        
Derivative Instruments, Gain (Loss) [Line Items]        
Derivative notional amount 675,000,000   675,000,000  
Ineffective increase to interest expense 6,000 $ 1,012,000 (26,000) $ 1,012,000
Estimated additional amount to be reclassified to interest expense     600,000  
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 $ 0 $ 0 $ 0 $ 2,000