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Fair Value Measurements - Assets and Liabilities Measured at Fair Value on a Recurring Basis (Details) - Recurring - USD ($) $ in Thousands | Sep. 30, 2018 | Dec. 31, 2017
--- | --- | ---
Assets: |  |
Derivative contracts (Note 13) | $ 13,486 | $ 1,043
Restoration plan assets | 4,865 | 5,576
Total | 18,351 | 6,619
Liabilities: |  |
Derivative contracts (Note 13) | 114 | 448
Total | 114 | 448
Quoted Prices in Active Markets (Level 1) |  |
Assets: |  |
Derivative contracts (Note 13) | 0 | 0
Restoration plan assets | 4,865 | 5,576
Total | 4,865 | 5,576
Liabilities: |  |
Derivative contracts (Note 13) | 0 | 0
Total | 0 | 0
Significant Other Observable Inputs (Level 2) |  |
Assets: |  |
Derivative contracts (Note 13) | 13,486 | 1,043
Restoration plan assets | 0 | 0
Total | 13,486 | 1,043
Liabilities: |  |
Derivative contracts (Note 13) | 114 | 448
Total | 114 | 448
Significant Unobservable Inputs (Level 3) |  |
Assets: |  |
Derivative contracts (Note 13) | 0 | 0
Restoration plan assets | 0 | 0
Total | 0 | 0
Liabilities: |  |
Derivative contracts (Note 13) | 0 | 0
Total | $ 0 | $ 0

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- Definition Fair value, after the effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets not subject to a master netting arrangement and not elected to be offset. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=99393222&loc=SL20226008-175313 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=109250915&loc=d3e13433-108611 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312 + Details
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