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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