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Long-Term Debt - Additional Information Related to Senior and Convertible Notes (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019 | Nov. 15, 2019 | Jun. 10, 2014
--- | --- | --- | --- | ---
Debt Instrument [Line Items] |  |  |  |
Principal amount | $ 1,703,324 |  |  |
Less: Unamortized discount | (112,798) | $ (139,981) |  |
Deferred issuance costs | (11,505) | (14,058) |  |
Total long-term debt | 1,579,021 | 1,448,461 |  |
Convertible Debt |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Principal amount | 1,702,414 | 1,602,500 |  |
6.0% Senior Notes | Senior Notes |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Principal amount | 0 | 650,000 |  |
Less: Unamortized discount |  | (8,425) |  |
Deferred issuance costs |  | (1,466) |  |
Total long-term debt |  | 640,109 |  |
4.625% Senior Notes | Senior Notes |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Principal amount | 750,000 | 0 |  |
Less: Unamortized discount | (5,523) |  |  |
Deferred issuance costs | (1,761) |  |  |
Total long-term debt | 742,716 |  |  |
3.25% Convertible Notes | Convertible Debt |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Additional paid-in capital | 37,688 | 37,700 |  | $ 37,700
Principal amount | 402,414 | 402,500 |  |
Less: Unamortized discount | (4,644) | (14,363) |  | $ (59,000)
Deferred issuance costs | (855) | (2,605) |  |
Total long-term debt | 396,915 | 385,532 |  |
1.75% Convertible Notes | Convertible Debt |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Additional paid-in capital | 88,138 | 88,138 | $ 88,100 |
Principal amount | 550,000 | 550,000 |  |
Less: Unamortized discount | (102,631) | (117,193) | (118,900) |
Deferred issuance costs | (8,889) | (9,987) | $ (2,800) |
Total long-term debt | $ 438,480 | $ 422,820 |  |

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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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