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Debt - Summary of Long-term Debt (Details) - USD ($) $ in Thousands | Dec. 31, 2021 | Oct. 08, 2021 | Dec. 31, 2020 | Oct. 07, 2020 | Nov. 15, 2019 | Jun. 10, 2014
--- | --- | --- | --- | --- | --- | ---
Debt Instrument [Line Items] |  |  |  |  |  |
Gross long-term debt | $ 1,191,276 |  |  |  |  |
Less: Unamortized discount | (91,593) |  | $ (112,798) |  |  |
Deferred issuance costs | (9,056) |  | (11,505) |  |  |
Total debt | 1,090,627 |  | 1,579,021 |  |  |
Less: current portion | (54,609) |  | (396,801) |  |  |
Total long-term debt, less current portion | 1,036,018 |  | 1,182,220 |  |  |
Senior Notes | 4.625% Senior Notes Due in 2030 |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Stated interest rate |  | 4.625% |  | 4.625% |  |
Gross long-term debt | 641,276 |  | 750,000 | $ 750,000 |  |
Less: Unamortized discount | (4,259) |  |  |  |  |
Deferred issuance costs | (1,339) |  |  |  |  |
Total debt | 635,678 |  |  |  |  |
Convertible Debt |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Gross long-term debt | 1,191,276 |  | 1,702,414 |  |  |
Convertible Debt | 3.25% Convertible Notes |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Stated interest rate |  |  |  |  |  | 3.25%
Gross long-term debt | 0 |  | 402,414 |  |  |
Less: Unamortized discount | 0 |  | (4,644) |  |  | $ (59,000)
Deferred issuance costs | 0 |  | (855) |  |  |
Total debt | 0 |  | 396,915 |  |  |
Convertible Debt | 1.75% Convertible Notes |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Stated interest rate |  |  |  |  | 1.75% |
Gross long-term debt | 550,000 |  | 550,000 |  |  |
Less: Unamortized discount | (87,334) |  | (102,631) |  | $ (118,900) |
Deferred issuance costs | (7,717) |  | (8,889) |  | $ (2,800) |
Total debt | 454,949 |  | 438,480 |  |  |
Loans Payable | Paycheck Protection Program, CARES Act |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Gross long-term debt | $ 0 |  | $ 910 |  |  |

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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=123466204&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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