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Debt - Convertible Notes Hedge Transactions (Details) - USD ($) $ / shares in Units, $ in Thousands | 1 Months Ended | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Feb. 28, 2014 | Dec. 31, 2015 | Mar. 05, 2014 | Dec. 16, 2013 | Jun. 24, 2013 | Nov. 27, 2012
2017 Convertible Senior Notes [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Cost of the hedge transaction(s) |  | $ 50,595 |  |  |  |
Conversion price (in dollars per share) |  | $ 31.56 |  |  |  | $ 31.56
2020 Convertible Senior Notes [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Cost of the hedge transaction(s) |  | $ 18,113 |  |  |  |
Conversion price (in dollars per share) |  | $ 45.72 |  |  | $ 45.72 |
2021 Convertible Senior Notes [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Cost of the hedge transaction(s) |  | $ 19,545 |  |  |  |
Conversion price (in dollars per share) |  | $ 59.39 | $ 59.39 |  |  |
Hedging of Convertible Debt Instrument [Member] | 2017 Convertible Senior Notes [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Cost of the hedge transaction(s) | $ 27,900 |  |  |  |  |
Conversion price (in dollars per share) |  | 60.00 |  | $ 60.00 |  | $ 44.19
Hedging of Convertible Debt Instrument [Member] | 2020 Convertible Senior Notes [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Conversion price (in dollars per share) |  | 61.55 |  |  |  |
Hedging of Convertible Debt Instrument [Member] | 2021 Convertible Senior Notes [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Conversion price (in dollars per share) |  | $ 83.14 |  |  |  |

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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 Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition The premium (cost) of a hedge, expensed during the period. + References No definition available. + Details
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