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Financial Instruments Interest Rate Derivatives (Tables)
12 Months Ended
Dec. 31, 2018
Derivative Instruments and Hedging Activities Disclosure [Abstract]  
Schedule of Derivative Instruments [Table Text Block]
As of December 31, 2018, the following forward-starting interest rate swaps designated as cash flow hedges (in thousands, except number of instruments) were outstanding:
Interest Rate Derivatives
 
Number of Instruments
 
Notional Amount
 
Asset (Liability) Fair Value
Interest Rate Swaps
 
2

 
$
200,000

 
$
(4,676
)