Contractual interest rate for funds borrowed, under the debt agreement.

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Amount of unamortized debt discount (premium) and debt issuance costs.

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Amount, after accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs.

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Long-Term Debt Interest Rates (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Nov. 25, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 18, 2014	Dec. 08, 2014	Nov. 24, 2014
1.125% Notes
Debt Instrument [Line Items]
Unamortized discount and debt issuance costs	$ 5,659		$ 0
Debt instrument, interest rate	1.125%	1.125%	1.125%
1.625% Notes
Debt Instrument [Line Items]
Unamortized discount and debt issuance costs	$ 5,696		$ 0
Debt instrument, interest rate	1.625%	1.625%	1.625%
1.875% Senior Notes
Debt Instrument [Line Items]
Unamortized discount and debt issuance costs	$ 1,831		$ 2,841
Debt instrument, interest rate	1.875%		1.875%	1.875%	1.875%	1.875%
3.45% Senior Notes
Debt Instrument [Line Items]
Unamortized discount and debt issuance costs	$ 3,533		$ 0
Debt instrument, interest rate	3.45%	3.45%	3.45%
4.15% Senior Notes
Debt Instrument [Line Items]
Unamortized discount and debt issuance costs	$ 2,398		$ 2,884
Debt instrument, interest rate	4.15%		4.15%				4.15%
4.50% Senior Notes
Debt Instrument [Line Items]
Unamortized discount and debt issuance costs	$ 0		$ 589
Debt instrument, interest rate	4.50%		4.50%	4.50%
5.45% Senior Notes
Debt Instrument [Line Items]
Unamortized discount and debt issuance costs	$ 3,850		$ 4,004
Debt instrument, interest rate	5.45%		5.45%				5.45%
Floating Rate Notes
Debt Instrument [Line Items]
Unamortized debt issuance costs	$ 1,169		$ 0