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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 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Designated as Hedging Instrument | Interest Expense        
Derivative        
Amount of Gain or (Loss) Reclassified from Accumulated OCI into Income (Effective Portion) $ 555 $ (246) $ 748 $ (918)
Designated as Hedging Instrument | Interest Rate Contract        
Derivative        
Unrealized (loss) gain from the effective portion of derivative instruments 5,720 (3,863) 6,552 (1,343)
Not Designated as Hedging Instrument | Interest Expense        
Derivative        
Derivative Instruments, Gain (Loss) Recognized in Income, Net 2,793 (633) 149 1,720
Parent Company [Member]        
Derivative        
Unrealized (loss) gain from the effective portion of derivative instruments $ 5,720 $ (3,863) $ 6,552 $ (1,343)
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