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Derivative Instruments And Hedging Strategies (Tables)
 12 Months Ended
Dec. 31, 2018
Derivative Instruments and Hedging Activities Disclosure [Abstract]  
Recognized Gains (Losses) On Derivative Instruments Not Designated As Hedging Instruments
The Company recognized gains (losses) on derivative instruments not designated as hedging instruments for the years ended December 31 as follows (in thousands):
 
Derivative gains (losses), net
 
2018
 
2017
 
2016
Exchange option liability on subsidiary convertible senior notes
$
—

 
$
19,436

 
$
(13,826
)
Forward currency exchange, option and future contracts
—

 
291

 
(296
)
Exchange traded commodity swap, option and future contracts
—

 
—

 
(9
)
 
$
—

 
$
19,727

 
$
(14,131
)