Financial Instruments - Financial Assets and Credit Risk (Details) - USD ($) $ in Thousands	6 Months Ended	12 Months Ended
Jun. 30, 2020	Dec. 31, 2019
Concentration Risk [Line Items]
Maximum exposure	$ 443,498	$ 581,628
Trade receivables, net of allowance
Concentration Risk [Line Items]
Maximum exposure	329,979	481,732
Other taxes
Concentration Risk [Line Items]
Maximum exposure	54,008	60,924
Other current assets
Concentration Risk [Line Items]
Maximum exposure	17,306	17,225
Non-current financial assets
Concentration Risk [Line Items]
Maximum exposure	$ 19,809	$ 21,747

Maximum amount of loss due to credit risk that, based on the gross fair value of the financial instrument, the entity would incur if parties to the financial instruments that make up the concentration failed completely to perform according to the terms of the contracts and the collateral or other security, if any, for the amount due proved to be of no value to the entity.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 21
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=121572278&loc=d3e13537-108611

Name:	us-gaap_ConcentrationRiskCreditRiskFinancialInstrumentMaximumExposure
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration