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Long-term Debt - Narrative (Details) |  |  |  |  | 3 Months Ended | 6 Months Ended | 8 Months Ended | 9 Months Ended | 33 Months Ended |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Mar. 19, 2021 USD ($) day $ / shares | Feb. 10, 2021 USD ($) | Jan. 30, 2018 USD ($) $ / shares | Jan. 12, 2018 USD ($) | Sep. 30, 2021 USD ($) | Sep. 30, 2020 USD ($) | Jun. 16, 2020 USD ($) | Feb. 10, 2021 USD ($) | Sep. 30, 2021 USD ($) | Sep. 30, 2020 USD ($) | Sep. 30, 2021 USD ($) | Dec. 31, 2020 USD ($)
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Letters of credit outstanding |  |  |  |  | $ 16,500,000 |  |  |  | $ 16,500,000 |  | $ 16,500,000 |
Repayments of convertible debt |  |  |  |  |  |  |  |  | 125,952,000 | $ 20,078,000 |  |
Conversion price (in dollars per share) | $ / shares | $ 10.49 |  |  |  |  |  |  |  |  |  |  |
Debt instrument carried value |  |  |  |  | 160,434,000 |  |  |  | 160,434,000 |  | 160,434,000 | $ 165,759,000
Promissory Note |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, face amount |  |  |  | $ 25,000,000 |  |  |  |  |  |  |  |
Stated interest rate |  |  |  | 2.50% |  |  |  |  |  |  |  |
Settlement costs and expenses |  |  |  | $ 7,500,000 |  |  |  |  |  |  |  |
Debt instrument carried value |  |  |  |  | 17,500,000 |  |  |  | 17,500,000 |  | 17,500,000 |
Revolving Credit Facility |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity |  | $ 200,000,000 |  |  |  |  | $ 350,000,000 | $ 200,000,000 |  |  |  |
Long-term line of credit |  |  |  |  | 0 |  |  |  | 0 |  | 0 |
Remaining borrowing capacity |  |  |  |  | 61,400,000 |  |  |  | 61,400,000 |  | 61,400,000 |
Revolving Credit Facility | Minimum |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Commitment fee percentage |  |  |  |  |  |  | 0.25% | 0.375% |  |  |  |
Revolving Credit Facility | Minimum | London Interbank Offered Rate (LIBOR) |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate |  |  |  |  |  |  | 1.75% | 2.50% |  |  |  |
Revolving Credit Facility | Minimum | Base Rate |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate |  |  |  |  |  |  | 0.75% | 1.50% |  |  |  |
Revolving Credit Facility | Maximum |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Commitment fee percentage |  |  |  |  |  |  | 0.50% | 0.50% |  |  |  |
Revolving Credit Facility | Maximum | London Interbank Offered Rate (LIBOR) |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate |  |  |  |  |  |  | 3.00% | 3.75% |  |  |  |
Revolving Credit Facility | Maximum | Base Rate |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate |  |  |  |  |  |  | 2.00% | 2.75% |  |  |  |
Asset-based Revolving Credit Facility | Revolving Credit Facility |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity |  | $ 125,000,000 |  |  |  |  |  | $ 125,000,000 |  |  |  |
Debt instrument, springing maturity, term |  | 91 days |  |  |  |  |  |  |  |  |  |
Debt instrument, amount of indebtedness subject to springing maturity |  | $ 17,500,000 |  |  |  |  |  |  |  |  |  |
Debt instrument, covenant, minimum fixed charge coverage ratio |  | 1.0 |  |  |  |  |  |  |  |  |  |
Debt instrument, percentage of borrowing base outstanding subject to covenant |  | 15.00% |  |  |  |  |  |  |  |  |  |
Debt instrument, amount of borrowing base outstanding subject to covenant |  | $ 14,100,000 |  |  |  |  |  |  |  |  |  |
Asset-based Revolving Credit Facility | Revolving Credit Facility | Base Rate |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate |  | 0.50% |  |  |  |  |  |  |  |  |  |
Asset-based Revolving Credit Facility | Revolving Credit Facility | Minimum |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Commitment fee percentage |  | 0.375% |  |  |  |  |  |  |  |  |  |
Asset-based Revolving Credit Facility | Revolving Credit Facility | Minimum | London Interbank Offered Rate (LIBOR) |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate |  | 2.75% |  |  |  |  |  |  |  |  |  |
Asset-based Revolving Credit Facility | Revolving Credit Facility | Minimum | Base Rate |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate |  | 1.75% |  |  |  |  |  |  |  |  |  |
Asset-based Revolving Credit Facility | Revolving Credit Facility | Maximum |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Commitment fee percentage |  | 0.50% |  |  |  |  |  |  |  |  |  |
Asset-based Revolving Credit Facility | Revolving Credit Facility | Maximum | London Interbank Offered Rate (LIBOR) |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate |  | 3.25% |  |  |  |  |  |  |  |  |  |
Asset-based Revolving Credit Facility | Revolving Credit Facility | Maximum | Base Rate |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate |  | 2.25% |  |  |  |  |  |  |  |  |  |
Asset-based Revolving Credit Facility | Letter of Credit |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity |  | $ 50,000,000 |  |  |  |  |  | $ 50,000,000 |  |  |  |
1.5% Convertible Unsecured Senior Notes |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, face amount |  |  | $ 200,000,000 |  |  |  |  |  |  |  |  |
Repayments of convertible debt | $ 120,000,000 |  |  |  | $ 0 | $ 9,483,000 |  |  | $ 125,952,000 | 20,078,000 | $ 152,800,000 |
Debt instrument, repurchased face amount | 125,000,000 |  |  |  |  |  |  |  |  |  |  |
Stated interest rate |  |  |  |  | 1.50% |  |  |  | 1.50% |  | 1.50% |
Conversion ratio |  |  | 0.0222748 |  |  |  |  |  |  |  |  |
Conversion price (in dollars per share) | $ / shares |  |  | $ 44.89 |  |  |  |  |  |  |  |  |
Effective interest rate percentage |  |  | 6.00% |  |  |  |  |  |  |  |  |
Debt Instrument, principal amount repurchased |  |  |  |  | $ 0 | $ 17,200,000 |  |  | $ 131,400,000 | $ 34,881,000 | $ 174,000,000 |
Debt instrument carried value |  |  |  |  | $ 25,765,000 |  |  |  | $ 25,765,000 |  | $ 25,765,000 | $ 143,242,000
4.75% Convertible Senior Notes |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, face amount | 135,000,000 |  |  |  |  |  |  |  |  |  |  |
Proceeds from debt, net | $ 130,600,000 |  |  |  |  |  |  |  |  |  |  |
Stated interest rate | 4.75% |  |  |  | 4.75% |  |  |  | 4.75% |  | 4.75% |
Conversion ratio | 0.0953516 |  |  |  |  |  |  |  |  |  |  |
Percentage of conversion price | 130.00% |  |  |  |  |  |  |  |  |  |  |
Threshold trading days | day | 20 |  |  |  |  |  |  |  |  |  |  |
Threshold consecutive trading days | day | 30 |  |  |  |  |  |  |  |  |  |  |
Threshold consecutive trading days, sale price per share | day | 5 |  |  |  |  |  |  |  |  |  |  |
Measurement period | day | 5 |  |  |  |  |  |  |  |  |  |  |
Percentage of sales price per share | 98.00% |  |  |  |  |  |  |  |  |  |  |
Amount of indebtedness in event of default | $ 40,000,000 |  |  |  |  |  |  |  |  |  |  |

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- Definition The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the 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)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 2: 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 Reference 3: 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 + Details
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