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Debt - Conversion and Earnings Per Share Impact (Details) |  | 1 Months Ended | 3 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | ---
Nov. 27, 2017 USD ($) | Mar. 31, 2017 USD ($) | Dec. 31, 2013 d | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($) | Dec. 31, 2012 USD ($)
Debt Instrument [Line Items] |  |  |  |  |  |  |
Convertible notes settled by cash payment |  |  |  | $ 125,407,000 | $ 0 | $ 0 |
Convertible senior notes sold |  |  |  | 483,500,000 | 448,500,000 |  |
Total consideration allocated to re-acquisition of equity component |  |  |  | 1,532,000 | $ 1,280,000 |  |
2017 Convertible Senior Notes |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Convertible debt, threshold percentage of stock price trigger (exceeded) |  |  | 130.00% |  |  |  |
Convertible debt, threshold trading days (more than) | d |  |  | 20 |  |  |  |
Convertible debt, threshold consecutive trading days | d |  |  | 30 |  |  |  |
2017 Convertible Senior Notes | Secured Debt |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Gain (loss) on debt conversion |  |  |  | $ 0 |  |  |
Convertible Notes | 2017 Convertible Senior Notes |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Convertible notes settled by cash payment | $ 65,000,000 | $ 60,400,000 |  |  |  |  |
Convertible senior notes sold |  | 50,000,000.0 |  |  |  |  | $ 115,000,000.0
Extinguishment of liability component |  | 49,700,000 |  |  |  |  |
Total consideration allocated to re-acquisition of equity component |  | 10,700,000 |  |  |  |  |
Carrying value of repurchased notes |  | 48,900,000.0 |  |  |  |  |
Loss recognized on repurchase transaction |  | $ (800,000) |  |  |  |  |

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- Definition Face (par) amount of debt instrument at time of issuance. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=64930739&loc=d3e28878-108400 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28551-108399 + Details
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