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Debt, Net - Conversion and EPS Impact of Convertible Notes Hedging Transactions (Details) - Convertible Notes $ / shares in Units, $ in Thousands	6 Months Ended
	Jun. 30, 2018 USD ($) $ / shares
2020 Convertible Notes
Debt Instrument [Line Items]
Cost of the hedge transaction(s) | $	$ 18,113
Conversion price (USD per share)	$ 45.72
2020 Convertible Notes | Hedging of Convertible Debt Instrument
Debt Instrument [Line Items]
Conversion price (USD per share)	$ 61.55
2021 Convertible Notes
Debt Instrument [Line Items]
Cost of the hedge transaction(s) | $	$ 19,545
Conversion price (USD per share)	$ 59.39
2021 Convertible Notes | Hedging of Convertible Debt Instrument
Debt Instrument [Line Items]
Conversion price (USD per share)	$ 83.14

X

- 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

+ Details

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- Definition

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+ References

No definition available.

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- Definition

The premium (cost) of a hedge, expensed during the period.

+ References

No definition available.

+ Details

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