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Shareholders' equity - Schedule Of Cash Flow, Supplemental Disclosures, Shareholders' Equity (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Equity [Abstract]
Settlement and exchange of convertible notes with common or treasury stock	$ 0	$ 0	$ 53,207
Acquisition of treasury stock from settlement and exchange of convertible note hedge and warrants	$ 0	$ 56,075	$ 141,405

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- Definition

Treasury Stock, Settlement And Exchange Of Convertible Note Hedge And Warrant Agreements

+ References

No definition available.

+ Details

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- Definition

The value of the financial instrument(s) that the original debt is being converted into in a noncash (or part noncash) transaction. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or cash payments in the period.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=98513485&loc=d3e4304-108586

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 50
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=98513485&loc=d3e4332-108586

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- References

No definition available.

+ Details

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