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Long-Term Debt - Components of Interest Expense Related to Convertible Notes (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Debt Instrument [Line Items] |  |  |
Total interest expense related to Convertible Notes | $ 133,800 | $ 70,200 | $ 63,500
3.25% Convertible Notes | Convertible Debt |  |  |
Debt Instrument [Line Items] |  |  |
Cash interest expense (coupon interest expense) | 13,080 | 13,081 | 13,081
Non-cash amortization of discount on Convertible Notes | 9,717 | 9,171 | 8,655
Amortization of debt issuance costs | 1,749 | 1,600 | 1,462
Total interest expense related to Convertible Notes | 24,546 | 23,852 | $ 23,198
1.75% Convertible Notes | Convertible Debt |  |  |
Debt Instrument [Line Items] |  |  |
Cash interest expense (coupon interest expense) | 9,653 | 1,174 |
Non-cash amortization of discount on Convertible Notes | 14,563 | 1,718 |
Amortization of debt issuance costs | 1,098 | 122 |
Total interest expense related to Convertible Notes | $ 25,314 | $ 3,014 |

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- Definition Amount of noncash expense included in interest expense to amortize debt discount and premium associated with the related debt instruments. Excludes amortization of financing costs. Alternate captions include noncash interest expense. + 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 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3602-108585 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.8) -URI http://asc.fasb.org/extlink&oid=120395209&loc=SL114868664-224227 + Details
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