Debt - Schedule Of Components Of Debt (Details) - USD ($)	9 Months Ended	12 Months Ended
Sep. 30, 2020	Dec. 31, 2019	Apr. 16, 2020
Debt [Line Items]
Total debt	$ 1,065,286,000	$ 851,613,000
Current portion of long-term debt	6,977,000	7,511,000
Long-term debt	1,058,309,000	844,102,000
Senior \| $400 Million Senior Notes Due 2022
Debt [Line Items]
Total debt	215,701,000	397,680,000
Debt instrument face amount	$ 400,000,000	$ 400,000,000
Debt instrument effective interest rate	6.00%	6.00%
Deferred issuance costs	$ 900,000	$ 2,300,000
Senior \| $400 Million Senior Unsecured Notes Due 2029
Debt [Line Items]
Total debt	394,485,000	394,039,000
Debt instrument face amount	$ 400,000,000	$ 400,000,000
Debt instrument effective interest rate	3.88%	3.88%
Deferred issuance costs	$ 5,500,000	$ 6,000,000
Senior \| $600 Million Unsecured Revolving Credit Facility
Debt [Line Items]
Total debt	0	15,502,000
Total capacity		$ 600,000,000
Debt instrument effective interest rate		2.76%
Deferred issuance costs		$ 2,700,000
Unsecured Debt \| $450 Million Senior Unsecured Notes Due 2031
Debt [Line Items]
Total debt	443,707,000
Debt instrument face amount	$ 450,000,000
Debt instrument effective interest rate	3.86%
Deferred issuance costs	$ 6,300,000
Unsecured Debt \| $250 Million Unsecured Term Loan
Debt [Line Items]
Total debt		0
Debt instrument face amount			$ 250,000,000
Construction Loans
Debt [Line Items]
Total debt	0	$ 32,465,000
Debt instrument effective interest rate		6.23%
Deferred issuance costs		$ 600,000
Collateralized Mortgage
Debt [Line Items]
Total debt	$ 6,977,000	$ 7,511,000
Debt instrument effective interest rate	4.57%	4.57%
Fair value adjustment	$ 34,000	$ 200,000
Economic Development Loans
Debt [Line Items]
Total debt	$ 4,416,000	$ 4,416,000
Debt instrument effective interest rate	3.00%	3.00%
Other Noncurrent Assets \| Senior \| $600 Million Unsecured Revolving Credit Facility
Debt [Line Items]
Deferred issuance costs	$ 2,500,000

Amount of short-term and long-term debt and lease obligation.

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

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Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium.

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

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Amount of long-term debt and lease obligation, classified as current.

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Amount after unamortized (discount) premium and debt issuance costs of long-term debt classified as noncurrent and excluding amounts to be repaid within one year or the normal operating cycle, if longer. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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