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Financial Instruments - Derivatives and Hedging (Fair Value) (Details) - Interest Rate Swap - USD ($)
$ in Thousands
Jun. 30, 2019
Dec. 31, 2018
Derivatives, Fair Value [Line Items]    
Gross derivative assets $ 5,974 $ 18,630
Gross derivative liabilities (13,956) (2,571)
Net derivative assets (liabilities) $ (7,982) $ 16,059