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Debt 0.75% Senior convertible notes due 2022 Narrative (Details) |  | 3 Months Ended | 6 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | ---
May 13, 2017 | Jun. 30, 2018 USD ($) | Jun. 30, 2017 USD ($) | Jun. 30, 2018 USD ($) d | Jun. 30, 2017 USD ($) | Dec. 31, 2017 USD ($) | Jun. 12, 2017 USD ($) | May 12, 2017 USD ($) $ / shares
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Aggregate principal amount |  | $ 400,000,000 |  | $ 400,000,000 |  | $ 400,000,000 |  |
Proceeds from Convertible Debt |  |  |  | $ 0 | $ 389,000,000 |  |  |
Current Fiscal Year End Date |  |  |  | --12-31 |  |  |  |
Non-cash interest expense |  |  |  | $ 7,500,000 | 2,100,000 |  |  |
0.75% Senior Convertible Notes | Convertible Notes due 2022 |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Initial conversion rate adjustment, shares | 0.0100918 |  |  |  |  |  |  |
Senior Notes [Member] | 0.75% Senior Convertible Notes | Convertible Notes due 2022 |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Aggregate principal amount |  |  |  |  |  |  | $ 50,000,000 | $ 350,000,000.0
Interest rate on convertible notes |  |  |  |  |  |  |  | 0.75%
Proceeds from Convertible Debt |  |  | $ 389,000,000 |  |  |  |  |
Initial conversion price of convertible notes (in dollars per share) | $ / shares |  |  |  |  |  |  |  | $ 99.09
Contractual coupon interest rate |  | 700,000 | 400,000 | 1,500,000 | 400,000 |  |  |
Non-cash interest expense |  | 3,300,000 | 1,800,000 | 6,600,000 | 1,800,000 |  |  |
Amortization of debt issuance costs |  | $ 400,000 | 200,000 | $ 800,000 | $ 200,000 |  |  |
Effective interest rate |  | 5.14% |  | 5.14% |  |  |  |
Conversion price in event of fundamental change |  | 100.00% |  | 100.00% |  |  |  |
Conversion multiple |  | $ 1,000 |  | $ 1,000 |  |  |  |
Debt Instrument, Redemption Price, Percentage |  |  |  | 100.00% |  |  |  |
Senior Notes [Member] | Additional Paid-in Capital | 0.75% Senior Convertible Notes | Convertible Notes due 2022 |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Amount reclassified to stockholders' equity |  |  | $ 72,600,000 |  |  |  |  |
Senior Notes [Member] | Debt Instrument Conversion Term One | Minimum | 0.75% Senior Convertible Notes | Convertible Notes due 2022 |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Threshold consecutive trading days | d |  |  |  | 20 |  |  |  |
Threshold percentage of stock price trigger |  |  |  | 130.00% |  |  |  |
Senior Notes [Member] | Debt Instrument Conversion Term One | Maximum | 0.75% Senior Convertible Notes | Convertible Notes due 2022 |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Threshold consecutive trading days | d |  |  |  | 30 |  |  |  |
Senior Notes [Member] | Debt Instrument Conversion Term Two | 0.75% Senior Convertible Notes | Convertible Notes due 2022 |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Threshold consecutive trading days | d |  |  |  | 5 |  |  |  |
Senior Notes [Member] | Debt Instrument Conversion Term Two | Maximum | 0.75% Senior Convertible Notes | Convertible Notes due 2022 |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Threshold consecutive trading days | d |  |  |  | 5 |  |  |  |
Threshold percentage of stock price trigger |  |  |  | 98.00% |  |  |  |

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- Definition Amount of noncash expense included in interest expense to amortize debt discount and premium associated with the related debt instruments. Excludes amortization of financing costs. Alternate captions include noncash interest expense. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 1A -URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28541-108399 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.8) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 + Details
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