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Long-Term Debt (Details) - USD ($)		6 Months Ended
	Feb. 27, 2020	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2019
Long-term Debt [Abstract]
Payments on long-term debt		$ 150,000,000	$ 0
Carrying Value and Fair Value of Debt Outstanding [Abstract]
Carrying value		1,642,839,000		$ 1,369,767,000
Fair value		1,758,604,000		1,421,325,000
Unamortized debt discounts and issuance costs		(7,168,000)		(5,249,000)
Borrowings and Payments under the Revolving Credit Facility [Abstract]
Borrowings (Payments) on bank credit facilities		$ 424,991,000	(313,805,000)
2.72% Senior Notes Due February 27, 2020 [Member]
Long-term Debt [Abstract]
Interest rate		2.72%
Maturity Date		Feb. 27, 2020
Carrying Value and Fair Value of Debt Outstanding [Abstract]
Carrying value		$ 0		150,000,000
Fair value		$ 0		151,547,000
3.29% Senior Notes Due February, 27 2023 [Member]
Long-term Debt [Abstract]
Interest rate		3.29%
Maturity Date		Feb. 27, 2023
Carrying Value and Fair Value of Debt Outstanding [Abstract]
Carrying value		$ 350,000,000		350,000,000
Fair value		$ 366,605,000		353,216,000
4.2% Senior Notes Due March March 1, 2028 [Member]
Long-term Debt [Abstract]
Interest rate		4.20%
Maturity Date		Mar. 01, 2028
Carrying Value and Fair Value of Debt Outstanding [Abstract]
Carrying value		$ 500,000,000		500,000,000
Fair value		591,992,000		541,546,000
Bank Note Payable [Member]
Carrying Value and Fair Value of Debt Outstanding [Abstract]
Carrying value		7,000		16,000
Fair value		7,000		16,000
Revolving Credit Facility [Member]
Long-term Debt [Abstract]
Maximum borrowing capacity		$ 850,000,000
Credit facility, expiration date		Mar. 27, 2024
Credit facility, amount outstanding		$ 425,000,000
Credit facility and borrowings, amount available		$ 419,637,000
Interest rate		1.60%
Carrying Value and Fair Value of Debt Outstanding [Abstract]
Carrying value		$ 425,000,000		0
Fair value		425,000,000		0
Borrowings and Payments under the Revolving Credit Facility [Abstract]
Borrowings on bank credit facilities		582,038,000	1,276,716,000
Payments on bank credit facilities		(157,047,000)	(1,590,521,000)
Borrowings (Payments) on bank credit facilities		$ 424,991,000	$ (313,805,000)
Term Loan [Member]
Long-term Debt [Abstract]
Debt instrument, frequency of periodic payment		quarterly
Term loan		$ 343,750,000
Credit facility and borrowings, amount available		$ 375,000,000
Interest rate		1.60%
Carrying Value and Fair Value of Debt Outstanding [Abstract]
Carrying value		$ 375,000,000		375,000,000
Fair value		$ 375,000,000		$ 375,000,000
Term Loan [Member] | 2.72% Senior Notes Due February 27, 2020 [Member]
Long-term Debt [Abstract]
Payments on long-term debt	$ 150,000,000

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Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

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Fair value portion of debt instrument payable, including, but not limited to, notes payable and loans payable.

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Description of the frequency of periodic payments (monthly, quarterly, annual).

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

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Date when the debt instrument is scheduled to be fully repaid, in CCYY-MM-DD format.

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Amount, after accumulated amortization, of debt discount.

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The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

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Date the credit facility terminates, in CCYY-MM-DD format.

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Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

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Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding).

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Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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Amount of cash inflow from contractual arrangement with the lender, including but not limited to, letter of credit, standby letter of credit and revolving credit arrangements.

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The net cash inflow or cash outflow from a contractual arrangement with the lender, including letter of credit, standby letter of credit and revolving credit arrangements, under which borrowings can be made up to a specific amount at any point in time with either short term or long term maturity that is collateralized (backed by pledge, mortgage or other lien in the entity's assets).

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Amount of cash outflow for payment of an obligation from a lender, including but not limited to, letter of credit, standby letter of credit and revolving credit arrangements.

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The cash outflow for debt initially having maturity due after one year or beyond the normal operating cycle, if longer.

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