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Disclosures about fair value of financial instruments (Schedule of Assets and Liabilities Measured at Fair Value on a Recurring Basis) (Details) - Recurring - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Assets
Cash equivalents	$ 49,038	$ 118,948
Short-term Investments	25	0
Derivatives	58,107	55,463
Total Assets	107,170	174,411
Liabilities
Derivatives	14,037	14,203
Total Liabilities	14,037	14,203
Quoted Prices in Active Markets For Identical Assets (Level 1)
Assets
Cash equivalents	49,038	118,948
Short-term Investments	25	0
Derivatives	0	0
Total Assets	49,063	118,948
Liabilities
Derivatives	0	0
Total Liabilities	0	0
Significant Other Observable Inputs (Level 2)
Assets
Cash equivalents	0	0
Short-term Investments	0	0
Derivatives	58,107	55,463
Total Assets	58,107	55,463
Liabilities
Derivatives	14,037	14,203
Total Liabilities	14,037	14,203
Significant Unobservable Inputs (Level 3)
Assets
Cash equivalents	0	0
Short-term Investments	0	0
Derivatives	0	0
Total Assets	0	0
Liabilities
Derivatives	0	0
Total Liabilities	$ 0	$ 0

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Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

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Fair value portion of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.

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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.

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Fair value portion of investment securities, including, but not limited to, marketable securities, derivative financial instruments, and investments accounted for under the equity method.

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Fair value of financial and nonfinancial obligations.

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