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Fair Value Measurements (Narrative) (Details) | Dec. 31, 2021 USD ($) | Dec. 31, 2020 USD ($) | Jun. 17, 2020 USD ($)
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Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |
Total long-term facilities | $ 236,795,000 | $ 650,675,000 |
Embedded Derivative Financial Instruments |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |
10 percent decrease in stock price volatility, fair value | 166,100,000 |  |
10 percent increase in stock price volatility, fair value | $ 200,000,000 |  |
Embedded Derivative Financial Instruments | Measurement Input, Stock Price Volatility |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |
Derivative liability, measurement input | 0.33 |  |
Capped Call |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |
10 percent decrease in stock price volatility, fair value | $ 119,600,000 |  |
10 percent increase in stock price volatility, fair value | 95,800,000 |  |
Senior Notes |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |
Debt instrument, face amount |  |  | $ 287,500,000
Total long-term facilities | $ 225,140,000 | $ 212,073,000 |
2020 Cash Exchangeable Senior Notes | Senior Notes |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |
Debt instrument, face amount |  |  | $ 287,500,000

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- Definition Face (par) amount of debt instrument at time of issuance. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 1B -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=123466505&loc=SL123495323-112611 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=124435984&loc=d3e28551-108399 Reference 3: 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 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=124429444&loc=SL124452920-239629 Reference 5: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 55 -Paragraph 69C -URI http://asc.fasb.org/extlink&oid=123466577&loc=SL123495737-112612 Reference 6: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 55 -Paragraph 69B -URI http://asc.fasb.org/extlink&oid=123466577&loc=SL123495735-112612 + Details
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