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Long-Term Debt - Summary of Long-term Debt (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Oct. 07, 2020 | Dec. 31, 2019 | Nov. 15, 2019 | Jun. 10, 2014
--- | --- | --- | --- | --- | ---
Debt Instrument [Line Items] |  |  |  |  |
Gross long-term debt | $ 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 |  |
Less: Current portion | (396,801) |  | (385,532) |  |
Total long-term debt, less current portion | 1,182,220 |  | 1,062,929 |  |
Senior Notes | 6.0% Senior Notes |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Stated interest rate |  | 6.00% |  |  |
Gross long-term debt | 0 |  | 650,000 |  |
Less: Unamortized discount |  |  | (8,425) |  |
Deferred issuance costs |  |  | (1,466) |  |
Total long-term debt |  |  | 640,109 |  |
Senior Notes | 4.625% Senior Notes |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Stated interest rate |  | 4.625% |  |  |
Gross long-term debt | 750,000 |  | 0 |  |
Less: Unamortized discount | (5,523) |  |  |  |
Deferred issuance costs | (1,761) |  |  |  |
Total long-term debt | 742,716 |  |  |  |
Convertible Debt |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Gross long-term debt | 1,702,414 |  | 1,602,500 |  |
Convertible Debt | 3.25% Convertible Notes |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Stated interest rate |  |  |  |  | 3.25%
Gross long-term debt | 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 |  |
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 | (102,631) |  | (117,193) | $ (118,900) |
Deferred issuance costs | (8,889) |  | (9,987) | $ (2,800) |
Total long-term debt | 438,480 |  | 422,820 |  |
Loans Payable | Paycheck Protection Program, CARES Act |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Gross long-term debt | $ 910 |  | $ 0 |  |

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