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Fair Value Measurements and Derivative Instruments - Recurring (Details) - Fair Value, Measurements, Recurring - USD ($) $ in Thousands | Mar. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Level 1 |  |  |
Assets: |  |  |
Derivative financial instruments | [1],[2] | $ 0 | $ 0
Total Assets | [2] | 0 | 0
Liabilities: |  |  |
Derivative financial instruments | [2],[3] | 0 | 0
Total Liabilities | [2] | 0 | 0
Level 2 |  |  |
Assets: |  |  |
Derivative financial instruments | [1],[4] | 72,900 | 108,539
Total Assets | [4] | 72,900 | 108,539
Liabilities: |  |  |
Derivative financial instruments | [3],[4] | 196,293 | 259,705
Total Liabilities | [4] | 196,293 | 259,705
Level 3 |  |  |
Assets: |  |  |
Derivative financial instruments | [1],[5] | 0 | 0
Total Assets | [5] | 0 | 0
Liabilities: |  |  |
Derivative financial instruments | [3],[5] | 0 | 0
Total Liabilities | [5] | 0 | 0
Total |  |  |
Assets: |  |  |
Derivative financial instruments | [1] | 72,900 | 108,539
Total Assets |  | 72,900 | 108,539
Liabilities: |  |  |
Derivative financial instruments | [3] | 196,293 | 259,705
Total Liabilities |  | $ 196,293 | $ 259,705
[1] | Consists of foreign currency forward contracts, interest rate swaps and fuel swaps. Refer to the "Fair Value of Derivative Instruments" table for breakdown by instrument type.(5
[2] | Inputs based on quoted prices (unadjusted) in active markets for identical assets or liabilities that we have the ability to access. Valuation of these items does not entail a significant amount of judgment.
[3] | Consists of foreign currency forward contracts, interest rate swaps and fuel swaps. Refer to the "Fair Value of Derivative Instruments" table for breakdown by instrument type.
[4] | Inputs other than quoted prices included within Level 1 that are observable for the asset or liability, either directly or indirectly. For foreign currency forward contracts, interest rate swaps and fuel swaps, fair value is derived using valuation models that utilize the income valuation approach. These valuation models take into account the contract terms, such as maturity, as well as other inputs, such as foreign exchange rates and curves, fuel types, fuel curves and interest rate yield curves. Derivative instrument fair values take into account the creditworthiness of the counterparty and the Company.
[5] | Inputs that are unobservable. No Level 3 inputs were used in fair value measurements of Other financial instruments as of March 31, 2021 and December 31, 2020.

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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=121572278&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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