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Long-Term Debt, Schedule of Long-Term Debt (Details) - USD ($)		12 Months Ended
		Dec. 31, 2019	Dec. 31, 2018
Long-term debt [Abstract]
Long-term Debt		$ 1,375,016,000	$ 1,417,392,000
Unamortized debt issuance costs	[1]	(4,655,000)	(6,550,000)
Unamortized debt discount		(594,000)	(654,000)
Total		1,369,767,000	1,410,188,000
Bank Notes Payable [Member]
Long-term debt [Abstract]
Long-term Debt		16,000	19,000
Revolving Credit Facility Due March 27, 2024 [Member]
Long-term debt [Abstract]
Long-term Debt		$ 0	417,373,000
Credit facility, expiration date		Mar. 27, 2024
Long term debt, face amount		$ 850,000,000
Term Loan Due March 27, 2024
Long-term debt [Abstract]
Long-term Debt		$ 375,000,000	0
Debt maturity date		Mar. 27, 2024
Long term debt, face amount		$ 500,000,000
Senior Notes Series A Due February 27, 2020 [Member]
Long-term debt [Abstract]
Long-term Debt		$ 150,000,000	150,000,000
Debt maturity date		Feb. 27, 2020
Long term debt, face amount		$ 150,000,000
Senior Notes Series B Due February 27, 2023 [Member]
Long-term debt [Abstract]
Long-term Debt		$ 350,000,000	350,000,000
Debt maturity date		Feb. 27, 2023
Long term debt, face amount		$ 350,000,000
Senior Notes Due March 1, 2028 [Member]
Long-term debt [Abstract]
Long-term Debt		$ 500,000,000	500,000,000
Debt maturity date		Mar. 01, 2028
Long term debt, face amount		$ 500,000,000
Credit Line Due June 30, 2021 [Member]
Long-term debt [Abstract]
Long-term Debt		$ 0	$ 0
Credit facility, expiration date		Jun. 30, 2021
Long term debt, face amount		$ 10,000,000
Revolving Credit Facility [Member]
Long-term debt [Abstract]
Unamortized debt issuance costs		$ 2,650,000
Credit facility, expiration date		Mar. 27, 2024
[1] Unamortized debt issuance costs excludes $2,650,000 attributable to the Revolving Credit Facility (as defined below) included in other assets at December 31, 2019.

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- Definition

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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- Definition

Face (par) amount of debt instrument at time of issuance.

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

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Amount, after accumulated amortization, of debt discount (premium).

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- Definition

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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