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Financial Instruments and Derivatives (Outstanding Interest Rate Derivatives Designated as Cash Flow Hedges of Interest Rate Risk) (Details)
$ in Thousands
12 Months Ended
Dec. 31, 2018
USD ($)
Contract
Derivative  
Cash Flow Hedges Derivative Instruments at Fair Value, Net $ 300,000
Maximum Length of Time Hedged in Cash Flow Hedge 10 years
Designated as Hedging Instrument | Interest Rate Swap  
Derivative  
Number of Instruments | Contract 10
Derivative, Notional Amount $ 600,000