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Borrowings - Schedule of Borrowings (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020	Apr. 29, 2020	Jun. 13, 2016	Dec. 09, 2011
Debt Instrument [Line Items]
Total borrowings	$ 1,050,159	$ 1,050,215
Other borrowings	159	215
Less current portion	46	88
Less deferred debt issuance costs	4,621	4,824
Less unaccreted debt discount	903	949
Total long-term borrowings	$ 1,044,589	$ 1,044,354
4.20% Senior Notes, due December 2021
Debt Instrument [Line Items]
Stated interest rate	4.20%
Senior Notes \| 4.20% Senior Notes, due December 2021
Debt Instrument [Line Items]
Stated interest rate	4.20%	4.20%			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%		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%		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	$ 500,000
Less unaccreted debt discount			$ 900