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Long-Term Debt (Details) - USD ($)

9 Months Ended

12 Months Ended

Feb. 27, 2020

Sep. 30, 2020

Sep. 30, 2019

Dec. 31, 2019

Long-term Debt [Abstract]

Payments on long-term debt

$ 150,000,000

$ 60,000,000

Carrying Value and Fair Value of Debt Outstanding [Abstract]

Carrying value

1,578,344,000

$ 1,369,767,000

Fair value

1,683,071,000

1,421,325,000

Unamortized debt discounts and issuance costs

^[1]

(6,811,000)

(5,249,000)

Borrowings and Payments under the Revolving Credit Facility [Abstract]

Borrowings (Payments) on bank credit facilities

$ 360,139,000

(417,377,000)

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

$ 362,820,000

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

585,096,000

541,546,000

Bank Note Payable [Member]

Carrying Value and Fair Value of Debt Outstanding [Abstract]

Carrying value

155,000

16,000

Fair value

155,000

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 and borrowings, amount available

$ 484,637,000

Carrying Value and Fair Value of Debt Outstanding [Abstract]

Carrying value

^[2]

360,000,000

0

Fair value

^[2]

$ 360,000,000

$ 0

Variable interest rates

1.50%

2.90%

Amount excluded on unamortized debt discounts and issuance costs

$ 2,650,000

Borrowings and Payments under the Revolving Credit Facility [Abstract]

Borrowings on bank credit facilities

$ 582,212,000

1,294,647,000

Payments on bank credit facilities

(222,073,000)

(1,712,024,000)

Borrowings (Payments) on bank credit facilities

$ 360,139,000

$ (417,377,000)

Term Loan [Member]

Long-term Debt [Abstract]

Debt instrument, frequency of periodic payment

quarterly

Term loan

$ 343,750,000

Carrying Value and Fair Value of Debt Outstanding [Abstract]

Carrying value

^[2]

375,000,000

375,000,000

Fair value

^[2]

$ 375,000,000

$ 375,000,000

Variable interest rates

1.50%

2.90%

Term Loan [Member] | 2.72% Senior Notes Due February 27, 2020 [Member]

Long-term Debt [Abstract]

Payments on long-term debt

$ 150,000,000

[1]	Excludes $2,650,000 attributable to the Revolving Credit Facility included in other assets at December 31, 2019.
[2]	Variable interest rates of 1.5% and 2.9% at September 30, 2020 and December 31, 2019, respectively.

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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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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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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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