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Financial Instruments (Tables)
 6 Months Ended
Jun. 30, 2019
Derivative Instruments and Hedging Activities Disclosure [Abstract]  
Schedule of Derivative Instruments [Table Text Block]
As of June 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
 
Maturity Date
 
June 30, 2019
 
December 31, 2018
$
125,000

 
10/1/2019
 
$
(11,811
)
 
$
(2,914
)
$
75,000

 
10/1/2019
 
(7,101
)
 
(1,762
)
$
75,000

 
10/1/2019
 
(5,072
)
 
—

$
50,000

 
10/1/2019
 
(3,388
)
 
—

$
25,000

 
10/1/2019
 
(1,345
)
 
—

 
 
 
 
$
(28,717
)
 
$
(4,676
)