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Debt - Convertible Notes Hedge Transactions (Details) - USD ($) $ / shares in Units, $ in Thousands |  | 12 Months Ended
--- | --- | ---
Nov. 27, 2017 | Dec. 31, 2017
Debt Instrument [Line Items] |  |
Proceeds in connection with unwinding hedge transactions |  | $ 5,600
2017 Convertible Senior Notes |  |
Debt Instrument [Line Items] |  |
Conversion price (in dollars per share) |  | $ 31.56
2020 Convertible Senior Notes |  |
Debt Instrument [Line Items] |  |
Cost of the hedge transaction(s) |  | $ 18,113
Conversion price (in dollars per share) |  | $ 45.72
2021 Convertible Senior Notes |  |
Debt Instrument [Line Items] |  |
Cost of the hedge transaction(s) |  | $ 19,545
Conversion price (in dollars per share) |  | $ 59.39
Hedging of Convertible Debt Instrument | 2020 Convertible Senior Notes |  |
Debt Instrument [Line Items] |  |
Conversion price (in dollars per share) |  | 61.55
Hedging of Convertible Debt Instrument | 2021 Convertible Senior Notes |  |
Debt Instrument [Line Items] |  |
Conversion price (in dollars per share) |  | $ 83.14
Convertible Notes | 2017 Convertible Senior Notes |  |
Debt Instrument [Line Items] |  |
Shares received counterparties to hedge transaction, cancelled (in shares) | 621,612 |

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- Definition The price per share of the conversion feature embedded in the debt instrument. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 5 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6928298&loc=SL6031898-161870 + Details
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- Definition The cash inflow from a financial contract that meets the hedge criteria as either cash flow hedge, fair value hedge or hedge of net investment in foreign operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 27 -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3581-108585 + Details
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