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Market Risks and Derivative Hedge Contracts Market Risks and Derivative Hedge Contracts (Tables) | 6 Months Ended
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Jun. 30, 2018
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 Euro |  | $ | 464 |  |  | 1.16 |  | 7/19/2018
Forward sale pounds sterling |  | 2,521 |  |  | 1.33 |  | 7/19/2018
Forward sale Canadian dollar |  | 5,941 |  |  | 1.31 |  | 7/19/2018
Forward purchase Mexican peso |  | 1,692 |  |  | 20.68 |  | 7/19/2018
Forward purchase Norwegian krone |  | 985 |  |  | 8.12 |  | 7/19/2018
Forward sale Mexican peso |  | 6,083 |  |  | 20.71 |  | 7/19/2018
Derivatives Designated as Hedging Instruments Table |
Foreign currency derivative instruments | Balance Sheet Location |  | Fair Value at June 30, 2018 |  | Fair Value at December 31, 2017
|  |  |  | (In Thousands)
Forward purchase contracts |  | Current assets |  | $ | 158 |  |  | $ | 111 |
Forward sale contracts |  | Current assets |  | 22 |  |  | 130 |
Forward sale contracts |  | Current liabilities |  | (241 | ) |  | (255 | )
Forward purchase contracts |  | Current liabilities |  | — |  |  | (113 | )
Net asset (liability) |  |  |  | $ | (61 | ) |  | $ | (127 | )

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- Definition Tabular disclosure of the location and fair value amounts of derivative instruments (and nonderivative instruments that are designated and qualify as hedging instruments) reported in the statement of financial position. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4B -URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5624163-113959 + Details
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- Definition Tabular disclosure of the notional amounts of outstanding derivative positions. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1A -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5579245-113959 + Details
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