Debt - Schedule Of Components Of Debt (Details) - USD ($)	Mar. 31, 2021	Dec. 31, 2020
Debt [Line Items]
Long-term debt	$ 1,059,169,000	$ 1,058,738,000
Outstanding borrowings	$ 0	$ 0
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
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	$ 6,000,000.0	$ 6,100,000
Long-term debt	444,012,000	443,860,000
$400 Million Senior Unsecured Notes Due 2029 \| Senior
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	$ 5,200,000	$ 5,400,000
Long-term debt	394,786,000	394,635,000
$400 Million Senior Notes Due 2022 \| Senior
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	$ 600,000	$ 700,000
Long-term debt	215,955,000	215,827,000
$600 Million Unsecured Revolving Credit Facility \| Senior
Debt [Line Items]
Deferred issuance costs	2,400,000	2,300,000
Total capacity		600,000,000
Long-term debt	$ 0	$ 0

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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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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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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The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

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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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