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Financial Instruments and Derivatives - Effect of Derivative Instruments on Consolidated Statement of Operations (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Derivative        
Unrealized (loss) gain from the effective portion of derivative instruments $ (5,562) $ 4,245 $ (13,444) $ 10,797
Designated as Hedging Instrument | Interest Expense        
Derivative        
Amount of Gain or (Loss) Reclassified from Accumulated OCI into Income (Effective Portion) 411 548 1,734 1,296
Designated as Hedging Instrument | Interest Rate Contract [Member]        
Derivative        
Unrealized (loss) gain from the effective portion of derivative instruments (5,562) 4,245 (13,444) 10,797
Not Designated as Hedging Instrument [Member] | Interest Expense        
Derivative        
Derivative Instruments, Gain (Loss) Recognized in Income, Net $ 15,522 $ (433) $ 19,592 $ (284)