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Debt - Additional Information (Details) | Aug. 20, 2018 USD ($) $ / shares | Sep. 30, 2021 USD ($) $ / shares | Dec. 31, 2020 USD ($) | Sep. 30, 2020 $ / shares | Nov. 30, 2018 USD ($) | Jun. 26, 2015 USD ($)
--- | --- | --- | --- | --- | --- | ---
Debt Instrument [Line Items] |  |  |  |  |  |
Principal amount |  | $ 341,250,000 | $ 316,250,000 |  |  |
Conversion price (in dollars per share) | $ / shares |  | $ 101.38 |  | $ 101.38 |  |
Unamortized debt issuance costs |  | $ 2,726,000 | 3,809,000 |  |  |
Line of Credit |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Borrowing limit used |  | 1,100,000 |  |  |  |
2023 Convertible Notes |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Principal amount |  | $ 316,250,000 | 316,250,000 |  |  |
2023 Convertible Notes | Senior Notes |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Principal amount | $ 316,300,000 |  |  |  |  |
Interest rate (as a percent) | 2.00% | 2.00% |  |  |  |
Debt conversion ratio (in shares) | 0.0098643 |  |  |  |  |
Conversion price (in dollars per share) | $ / shares | $ 101.38 |  |  |  |  |
Credit Facility |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Principal amount |  | $ 25,000,000 | 0 |  |  |
Credit Facility | Line of Credit |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Maximum borrowing capacity |  |  |  |  |  | $ 550,000,000
Debt issuance costs |  |  |  |  | $ 1,700,000 |
Unamortized debt issuance costs |  | $ 1,000,000 | $ 1,300,000 |  |  |

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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/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=123466204&loc=SL6031897-161870 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -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=120400017&loc=d3e572229-122910 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -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=120391452&loc=d3e13212-122682 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -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=120398452&loc=d3e534808-122878 + Details
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