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 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Credit Risk Contract [Member]        
Derivative Instruments, Gain (Loss) [Line Items]        
Net liability $ 10,800,000   $ 10,800,000  
Settlement obligation 10,800,000   10,800,000  
Designated as Hedging Instrument [Member] | Cash Flow Hedging [Member]        
Derivative Instruments, Gain (Loss) [Line Items]        
Derivative notional amount 350,000,000   350,000,000  
Ineffective increase to interest expense 99,000   1,012,000  
Estimated additional amount to be reclassified to interest expense     3,400,000  
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 $ 1,000 $ 17,000 $ 2,000 $ 80,000