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Market Risks and Derivative Hedge Contracts Market Risks and Derivative Hedge Contracts (Tables)
 9 Months Ended
Sep. 30, 2016
Derivative Instruments and Hedging Activities Disclosure [Abstract]  
Schedule of Notional Amounts of Outstanding Derivative Positions Table
Derivative Contracts
 
US Dollar Notional Amount
 
Traded Exchange Rate
 
Settlement Date

 
(In Thousands)
 

 

Forward purchase pounds sterling
 
4,635

 
1.31
 
10/19/2016
Forward purchase Mexican peso
 
6,758

 
19.38
 
10/19/2016
Forward sale Norwegian krone
 
1,218

 
8.21
 
10/19/2016
Forward sale Mexican peso
 
2,781

 
19.38
 
10/19/2016
Derivatives Designated as Hedging Instruments Table
Foreign currency derivative instruments
Balance Sheet Location
 
 Fair Value at
September 30, 2016
 
 Fair Value at December 31, 2015

 

 
(In Thousands)
Forward sale contracts
 
Current assets
 
$
6

 
$
23

Forward purchase contracts
 
Current assets
 
—

 
—

Forward sale contracts
 
Current liabilities
 
(32
)
 
(31
)
Forward purchase contracts
 
Current liabilities
 
(73
)
 
(354
)
Net asset (liability)
 

 
$
(99
)
 
$
(362
)