Debt - Schedule of Components of Debt (Details) - USD ($)	Dec. 31, 2021	Dec. 31, 2020	Jul. 23, 2020	Nov. 27, 2019	Jun. 27, 2012
Debt Instrument [Line Items]
Total debt	$ 1,060,474,000	$ 1,058,738,000
Less current portion	216,351,000	0
Total long-term debt	$ 844,123,000	$ 1,058,738,000
Economic Development Loans
Debt Instrument [Line Items]
Debt instrument effective interest rate	3.00%	3.00%
Total debt	$ 4,416,000	$ 4,416,000
2020 Senior Notes | Senior Notes
Debt Instrument [Line Items]
Debt instrument, face amount	$ 450,000,000		$ 450,000,000
Debt instrument effective interest rate	3.86%
Deferred issuance costs	$ 5,500,000	6,100,000
Total debt	444,470,000	443,860,000
2019 Senior Notes | Senior Notes
Debt Instrument [Line Items]
Debt instrument, face amount	$ 400,000,000	$ 400,000,000		$ 400,000,000
Debt instrument effective interest rate	3.88%	3.88%		3.88%
Deferred issuance costs	$ 4,800,000	$ 5,400,000
Total debt	395,237,000	394,635,000
2012 Senior Notes
Debt Instrument [Line Items]
Total debt	216,400,000
2012 Senior Notes | Senior Notes
Debt Instrument [Line Items]
Debt instrument, face amount	$ 400,000,000	$ 400,000,000			$ 400,000,000
Debt instrument effective interest rate	6.00%	6.00%			6.00%
Deferred issuance costs	$ 200,000	$ 700,000
Total debt	216,351,000	215,827,000
$600 Million Senior Unsecured Credit Facility | Senior Notes
Debt Instrument [Line Items]
Deferred issuance costs	2,300,000	2,400,000
Line of credit maximum borrowing capacity		600,000,000
Total debt	$ 0	$ 0