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Debt - Schedule of Components of Long-term Debt (Details) - USD ($) | Sep. 30, 2020 | Apr. 15, 2020 | Dec. 31, 2019 | Aug. 06, 2019 | Dec. 31, 2016
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Debt Instrument [Line Items] |  |  |  |  |
Finance Lease, Liability, Current, Statement of Financial Position [Extensible List] | us-gaap:LongTermDebtAndCapitalLeaseObligationsCurrent |  | us-gaap:LongTermDebtAndCapitalLeaseObligationsCurrent |  |
Finance Lease, Liability, Noncurrent, Statement of Financial Position [Extensible List] | us-gaap:LongTermDebtAndCapitalLeaseObligations |  | us-gaap:LongTermDebtAndCapitalLeaseObligations |  |
Finance leases | $ 6,000,000.0 |  | $ 5,300,000 |  |
Other debt | 59,700,000 |  | 59,600,000 |  |
Total | 148,400,000 |  | 579,400,000 |  |
Less – current maturities | 100,000,000.0 |  | 13,500,000 |  |
Total long-term debt | 48,400,000 |  | $ 565,900,000 |  |
5.50% convertible senior notes due March 1, 2021 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Face value |  |  |  |  | $ 1,000
Senior Notes | 10.75% senior notes |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Interest rate |  | 10.75% | 10.75% |  |
Face value |  |  | $ 440,000,000.0 |  |
Unamortized discount and fees |  |  | 5,500,000 |  |
Senior notes | $ 0 |  | 434,500,000 |  |
Senior Notes | 5.50% convertible senior notes due March 1, 2021 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Interest rate | 5.50% |  |  |  | 5.50%
Face value | $ 84,200,000 |  | 84,200,000 |  | $ 213,500,000
Unamortized discount and fees | 1,500,000 |  | 4,200,000 |  |
Senior notes | $ 82,700,000 |  | $ 80,000,000.0 | $ 84,200,000 |

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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=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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- Definition Contractual interest rate for funds borrowed, under the debt agreement. + References Reference 1: 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(a)(1)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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- Definition Amount, after accumulated amortization, of debt discount. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 1A -URI http://asc.fasb.org/extlink&oid=119993939&loc=d3e28541-108399 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=114775985&loc=d3e28878-108400 + Details
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