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Borrowings - Schedule of Borrowings (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Apr. 29, 2020 | Dec. 31, 2019 | Jun. 13, 2016 | Dec. 09, 2011 | Dec. 06, 2010
--- | --- | --- | --- | --- | --- | ---
Debt Instrument [Line Items] |  |  |  |  |  |
Total borrowings | $ 1,050,215 |  | $ 850,622 |  |  |
Less current portion | 88 |  | 388 |  |  |
Less deferred debt issuance costs | 4,824 |  | 983 |  |  |
Less unaccreted debt discount | 949 |  | 387 |  |  |
Long-term borrowings | 1,044,354 |  | 848,864 |  |  |
Revolving Credit Facility |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Total borrowings | $ 0 |  | $ 0 |  |  |
4.50% Senior Notes, due December 2020 |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Stated interest rate |  |  | 4.50% |  |  | 4.50%
4.20% Senior Notes, due December 2021 |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Stated interest rate | 4.20% |  | 4.20% |  | 4.20% |
3.20% Senior Notes, due June 2023 |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Stated interest rate | 3.20% |  | 3.20% |  |  |
3.37% Senior Notes, due June 2025 |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Stated interest rate | 3.37% |  | 3.37% |  |  |
3.00% Senior Notes, due May 2030 |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Stated interest rate | 3.00% |  |  |  |  |
Senior Notes | 4.50% Senior Notes, due December 2020 |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Stated interest rate | 4.50% |  |  |  |  |
Total borrowings | $ 0 |  | $ 300,000 |  |  |
Senior Notes | 4.20% Senior Notes, due December 2021 |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Stated interest rate | 4.20% |  |  |  |  |
Total borrowings | $ 350,000 |  | 350,000 |  |  |
Senior Notes | 3.20% Senior Notes, due June 2023 |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Stated interest rate | 3.20% |  |  | 3.20% |  |
Total borrowings | $ 100,000 |  | 100,000 |  |  |
Senior Notes | 3.37% Senior Notes, due June 2025 |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Stated interest rate | 3.37% |  |  | 3.37% |  |
Total borrowings | $ 100,000 |  | 100,000 |  |  |
Senior Notes | 3.00% Senior Notes, due May 2030 |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Stated interest rate | 3.00% | 3.00% |  |  |  |
Total borrowings | $ 500,000 |  | 0 |  |  |
Less unaccreted debt discount |  | $ 900 |  |  |  |
Other Borrowings |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Total borrowings | $ 215 |  | $ 622 |  |  |

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