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Fair Value of Derivatives and Financial Instruments (Effect of Derivative Instruments on Consolidated Statement of Operations) (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Designated as Hedging Instrument | Interest Expense        
Derivative        
Amount of Gain or (Loss) Reclassified from Accumulated OCI into Income (Effective Portion) $ 548 $ 33 $ 1,296 $ (884)
Designated as Hedging Instrument | Interest Rate Contract        
Derivative        
Unrealized (loss) gain from the effective portion of derivative instruments 4,245 90 10,797 (1,252)
Not Designated as Hedging Instrument | Interest Expense        
Derivative        
Derivative Instruments, Gain (Loss) Recognized in Income, Net (433) 4,107 (284) 5,827
Parent Company [Member]        
Derivative        
Unrealized (loss) gain from the effective portion of derivative instruments $ 4,245 $ 90 $ 10,797 $ (1,252)
Minimum [Member] | Conventional Variable Rate Debt [Member]        
Derivative        
Debt Renewal Period     30 days  
Maximum [Member] | Conventional Variable Rate Debt [Member]        
Derivative        
Debt Renewal Period     90 days