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Debt - Convertible Senior Notes (Details) - USD ($) |  | 3 Months Ended | 6 Months Ended |
--- | --- | --- | --- | ---
Aug. 12, 2014 | Jun. 30, 2017 | Jun. 30, 2016 | Jun. 30, 2017 | Jun. 30, 2016 | Dec. 31, 2016
Debt Instrument [Line Items] |  |  |  |  |  |
Face amount of debt |  | $ 1,127,750,000 |  | $ 1,127,750,000 |  | $ 259,000,000
Fair value of debt |  | 1,104,041,000 |  | 1,104,041,000 |  | 255,291,000
Unamortized debt issuance costs |  | 23,709,000 |  | 23,709,000 |  | 3,709,000
Net carrying value |  | 226,998,000 |  | 226,998,000 |  | 226,291,000
2019 Notes |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Face amount of debt | $ 230,000,000.0 | 230,000,000 |  | $ 230,000,000 |  | 230,000,000
Interest rate (as a percent) | 0.75% |  |  |  |  |
Long term debt, unamortized debt issuance costs | $ 7,100,000 |  |  |  |  |
Conversion ratio | 0.0188072 |  |  | 0.0188072 |  |
Conversion price (in dollars per share) | $ 53.17 |  |  |  |  |
Repurchase price, expressed as a percentage of principal of debt repurchased | 100.00% |  |  |  |  |
Fair value of debt |  | $ 217,400,000 |  | $ 217,400,000 |  |
Effective interest rate |  | 1.38% |  | 1.38% |  |
Additional interest for non-compliance |  |  |  | 0.25% |  |
Second additional interest for non-compliance |  |  |  | 0.50% |  |
Contractual interest expense |  | $ 432,000 | $ 432,000 | $ 863,000 | $ 863,000 |
Contingent interest expense |  | 0 | $ 0 | 288,000 | $ 0 |
Principal amount | $ 230,000,000 | 230,000,000 |  | 230,000,000 |  | 230,000,000
Unamortized debt issuance costs |  | 3,002,000 |  | 3,002,000 |  | 3,709,000
Net carrying value |  | $ 226,998,000 |  | $ 226,998,000 |  | $ 226,291,000

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- Definition Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(16)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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