Annual report pursuant to Section 13 and 15(d)

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

v3.6.0.2
Deferred Charges, Goodwill And Other Assets, Net (Narrative) (Details) - Cash Flow Hedging [Member] - USD ($)
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Designated as Hedging Instrument [Member]      
Derivative Instruments, Gain (Loss) [Line Items]      
Derivative notional amount $ 350,000,000    
Ineffective increase to interest expense 600,000 $ 0 $ 0
Estimated additional amount to be reclassified to interest expense 1,700,000    
Not Designated as Hedging Instrument [Member]      
Derivative Instruments, Gain (Loss) [Line Items]      
Amount of increase in the fair value of derivatives $ 2,000 $ 93,000 $ 79,000