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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, 2018	Dec. 31, 2017
Assets
Cash equivalents	$ 118,948	$ 93,541
Short-term Investments	0	19,588
Derivatives	55,462	35,378
Total Assets	174,410	148,507
Liabilities
Derivatives	14,203	23,545
Share-based compensation	0	1,483
Total Liabilities	14,203	25,028
Quoted Prices in Active Markets For Identical Assets (Level 1)
Assets
Cash equivalents	118,948	93,541
Short-term Investments	0
Derivatives	0
Total Assets	118,948	93,541
Liabilities
Derivatives	0	0
Share-based compensation	0	0
Total Liabilities	0	0
Significant Other Observable Inputs (Level 2)
Assets
Cash equivalents	0
Short-term Investments	0	19,588
Derivatives	55,462	35,378
Total Assets	55,462	54,966
Liabilities
Derivatives	14,203	23,545
Share-based compensation	0	1,483
Total Liabilities	14,203	25,028
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
Share-based compensation	0	0
Total Liabilities	$ 0	$ 0

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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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