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Financial Instruments (Tables)
 9 Months Ended
Sep. 30, 2019
Derivative Instruments and Hedging Activities Disclosure [Abstract]  
Schedule of Derivative Instruments [Table Text Block]
As of September 30, 2019 and December 31, 2018, the following forward-starting interest rate swaps designated as cash flow hedges (in thousands) were outstanding:
 
 
Asset (Liability) Fair Value
Notional Amount
 
September 30, 2019
 
December 31, 2018
$
125,000

 
$
(16,630
)
 
$
(2,914
)
75,000

 
(9,993
)
 
(1,762
)
75,000

 
(7,914
)
 
—

50,000

 
(5,283
)
 
—

25,000

 
(2,284
)
 
—

$
350,000

 
$
(42,104
)
 
$
(4,676
)