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Debt - 5.00% Convertible Senior Notes Due 2021 (Details) - USD ($) shares in Millions | 3 Months Ended | 8 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Mar. 31, 2020 | Mar. 31, 2019 | Dec. 31, 2019 | Dec. 31, 2019 | Dec. 21, 2017
Debt Instrument [Line Items] |  |  |  |  |
Principal amount of long-term debt | $ 631,234,000 |  | $ 634,737,000 | $ 634,737,000 |
Unamortized discount and deferred financing costs | 21,345,000 |  | 22,806,000 | 22,806,000 |
Long-term debt | $ 609,889,000 |  | 611,931,000 | 611,931,000 |
7.75% Senior Secured Notes due 2025 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt instrument, interest rate | 7.75% |  |  |  |
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 | $ 45,400,000 |  |  |  |
Senior Notes | 7.75% Senior Secured Notes due 2025 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt instrument, interest rate | 7.75% |  |  |  | 7.75%
Principal amount of long-term debt | $ 300,000,000 |  | 300,000,000 | 300,000,000 | $ 300,000,000
Convertible Debt | 5.00% Convertible Senior Notes due 2021 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt instrument, interest rate | 5.00% |  |  |  |
Principal amount of long-term debt | $ 48,665,000 |  | 48,665,000 | 48,665,000 |
Unamortized discount and deferred financing costs | 3,300,000 |  |  |  |
Repurchased face amount |  |  | 66,300,000 | 66,300,000 |
Repurchased amount in cash |  |  | $ 18,600,000 |  |
Repurchased amount, shares (in shares) |  |  | 3.2 |  |
Repurchase amount, fair value |  |  | $ 74,300,000 |  |
Gain (loss) on extinguishment of debt | $ 0 | $ 0 |  | $ (6,100,000) |

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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=109500613&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=119400593&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=6877327&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=6876686&loc=d3e534808-122878 + Details
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