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Risk Management and Derivatives (Tables)
3 Months Ended
Mar. 31, 2018
Derivative Instruments and Hedging Activities Disclosure [Abstract]  
Changes in Foreign Currency Exchange Rates and Derivative Foreign Currency Forward Contracts
Included in other income, net were the following amounts related to changes in foreign currency exchange rates and derivative foreign currency contracts:
 
Three Months Ended March 31,
(In thousands)
2018
 
2017
Unrealized foreign currency exchange rate gains (losses)
$
(5,030
)
 
$
8,313

Realized foreign currency exchange rate gains (losses)
(2,374
)
 
(272
)
Unrealized derivative gains (losses)
35

 
(704
)
Realized derivative gains (losses)
4,226

 
(6,366
)