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Fair Value of Financial Instruments (Tables)
 9 Months Ended
Sep. 30, 2017
Fair Value Disclosures [Abstract]  
Changes in Fair Value of Derivatives
 
 
Three Months Ended September 30,
 
Nine Months Ended September 30,
(In thousands)
 
2017
 
2016
 
2017
 
2016
Change in fair value:
 
 
 
 
 
 
 
 
Recognized in earnings
 
$
(1
)
 
$
1

 
$
(2
)
 
$
(9
)
Recognized in other comprehensive income
 
171

 
431

 
503

 
(383
)
 
 
$
170

 
$
432

 
$
501

 
$
(392
)