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Earnings Per Share - Antidilutive Securities (Details) - $ / shares shares in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Oct. 31, 2017
Antidilutive Securities Excluded from Computation of Earnings Per Share
Total anti-dilutive securities	970	5,780	5,580
Convertible Debt | Convertible Notes, due 2024
Antidilutive Securities Excluded from Computation of Earnings Per Share
Debt instrument, conversion price (usd per share)	$ 58.725
Convertible Debt | Convertible Notes, due 2024 | Maximum
Antidilutive Securities Excluded from Computation of Earnings Per Share
Debt instrument, conversion price (usd per share)	$ 71.775			$ 71.775
Share-based awards
Antidilutive Securities Excluded from Computation of Earnings Per Share
Total anti-dilutive securities	150	220	400
Convertible note hedge and capped call transactions
Antidilutive Securities Excluded from Computation of Earnings Per Share
Total anti-dilutive securities	820	380	0
Warrants
Antidilutive Securities Excluded from Computation of Earnings Per Share
Total anti-dilutive securities	0	5,180	5,180

X

- Definition

Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 260
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257

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- Definition

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+ References

No definition available.

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- Definition

The price per share of the conversion feature embedded in the debt instrument.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 20
-Section 50
-Paragraph 5
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=109500613&loc=SL6031898-161870

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