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Long-Term Debt, Carrying Value and Fair Value of Debt Outstanding (Details) - USD ($)	6 Months Ended	12 Months Ended
	Jun. 30, 2021	Dec. 31, 2020
Carrying Value and Fair Value of Debt Outstanding [Abstract]
Carrying value	$ 1,281,417,000	$ 1,475,040,000
Fair value	1,351,768,000	1,570,693,000
Unamortized debt discounts and issuance costs	(5,738,000)	(6,454,000)
Long-term Debt	1,275,679,000	1,468,586,000
3.29% Senior Notes Due February, 27 2023 [Member]
Carrying Value and Fair Value of Debt Outstanding [Abstract]
Carrying value	350,000,000	350,000,000
Fair value	$ 361,800,000	364,538,000
Interest rate	3.29%
Maturity Date	Feb. 27, 2023
4.2% Senior Notes Due March 1, 2028 [Member]
Carrying Value and Fair Value of Debt Outstanding [Abstract]
Carrying value	$ 500,000,000	500,000,000
Fair value	$ 558,551,000	581,115,000
Interest rate	4.20%
Maturity Date	Mar. 01, 2028
Credit line due June 30, 2021 [Member]
Carrying Value and Fair Value of Debt Outstanding [Abstract]
Carrying value	$ 0	0
Fair value	0	0
Bank Note Payable [Member]
Carrying Value and Fair Value of Debt Outstanding [Abstract]
Carrying value	1,417,000	40,000
Fair value	1,417,000	40,000
Revolving Credit Facility [Member]
Carrying Value and Fair Value of Debt Outstanding [Abstract]
Carrying value	55,000,000	250,000,000
Fair value	$ 55,000,000	$ 250,000,000
Variable interest rates	1.50%	1.50%
Term Loan [Member]
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
Long-term Debt	$ 343,750,000

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Percentage points added to the reference rate to compute the variable rate on the debt instrument.

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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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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 20
-Section 50
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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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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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