Debt - Schedule Of Components Of Debt (Details) - USD ($)	Sep. 30, 2021	Dec. 31, 2020
Debt [Line Items]
Long-term debt	$ 1,060,037,000	$ 1,058,738,000
Less current portion	216,217,000	0
Long-term debt	$ 843,820,000	$ 1,058,738,000
Economic Development Loans
Debt [Line Items]
Debt instrument effective interest rate	3.00%	3.00%
Long-term debt	$ 4,416,000	$ 4,416,000
$450 Million Senior Unsecured Notes Due 2031 \| Senior Notes
Debt [Line Items]
Debt instrument face amount	$ 450,000,000	$ 450,000,000
Debt instrument effective interest rate	3.86%	3.86%
Deferred issuance costs	$ 5,700,000	$ 6,100,000
$400 Million Senior Unsecured Notes Due 2029 \| Senior Notes
Debt [Line Items]
Debt instrument face amount	$ 400,000,000	$ 400,000,000
Debt instrument effective interest rate	3.88%	3.88%
Deferred issuance costs	$ 4,900,000	$ 5,400,000
$400 Million Senior Notes Due 2022 \| Senior Notes
Debt [Line Items]
Debt instrument face amount	$ 400,000,000	$ 400,000,000
Debt instrument effective interest rate	6.00%	6.00%
Deferred issuance costs	$ 400,000	$ 700,000
$600 Million Unsecured Revolving Credit Facility \| Senior Notes
Debt [Line Items]
Deferred issuance costs	2,400,000	2,400,000
Total capacity	600,000,000	600,000,000
Long-term debt	$ 0	$ 0

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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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, 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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