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Debt - 5.00% Convertible Senior Notes Due 2021 (Details) - USD ($) $ in Thousands, shares in Millions | 8 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Dec. 31, 2019 | Sep. 30, 2019 | Sep. 30, 2020
Debt Instrument [Line Items] |  |  |
Principal amount of long-term debt | $ 634,737 |  | $ 735,085
Unamortized discount and deferred financing costs | 22,806 |  | 24,572
Long-term debt | 611,931 |  | $ 710,513
Gain (loss) on extinguishment of debt |  | $ 3,700 |
5.00% Convertible Senior Notes due 2021 |  |  |
Debt Instrument [Line Items] |  |  |
Debt instrument, interest rate |  |  | 5.00%
5.00% Convertible Senior Notes due 2021 | Carrying Value |  |  |
Debt Instrument [Line Items] |  |  |
Long-term debt |  |  | $ 46,600
Convertible Debt | 5.00% Convertible Senior Notes due 2021 |  |  |
Debt Instrument [Line Items] |  |  |
Debt instrument, interest rate |  | 5.00% | 5.00%
Principal amount of long-term debt | 48,665 |  | $ 48,665
Unamortized discount and deferred financing costs |  |  | $ 2,000
Repurchased face amount | 66,300 |  |
Repurchased amount in cash | $ 18,600 |  |
Repurchased amount, shares (in shares) | 3.2 |  |
Repurchase amount, fair value | $ 74,300 |  |

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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=120520924&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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