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Long-Term Debt (Narrative) (Details) - USD ($)
 1 Months Ended 3 Months Ended
Dec. 31, 2019
Jun. 30, 2021
Dec. 30, 2023
Dec. 24, 2022
Sep. 30, 2017
Dec. 31, 2010
Debt Instrument [Line Items]            
Property and equipment with undepreciated cost pledge as collateral for long term debt     $ 254,800,000      
Excess net worth calculated under covenants in the Notes, the Bonds, and the Line     484,400,000      
Line of Credit [Member]            
Debt Instrument [Line Items]            
Line of credit facility borrowing capacity     150,000,000.0      
Borrowings outstanding     $ 0      
Debt maturity date     Jun. 01, 2026      
Letter of Credit [Member]            
Debt Instrument [Line Items]            
Line of credit facility borrowing capacity     $ 10,000,000.0      
Borrowings outstanding     0      
Cash Flow Hedging [Member]            
Debt Instrument [Line Items]            
Other comprehensive loss, net of income taxes     3,800,000      
Unrealized gains (losses) on cash flow hedge       $ 12,400,000    
Senior Notes, Maturing 2031 [Member]            
Debt Instrument [Line Items]            
Debt instrument principal amount   $ 350,000,000.0        
Debt instrument stated interest rate   4.00%        
Maturity period of senior notes   2031        
Secured Debt Maturing October 2027 [Member]            
Debt Instrument [Line Items]            
Secured borrowing         $ 60,000,000  
Secured Debt Maturing October 2027 [Member] | Interest Rate Swap [Member]            
Debt Instrument [Line Items]            
Derivative notional amount     $ 23,000,000.0      
Derivative, fixed interest rate     3.962%      
Monthly principal amortization     $ 500,000      
Derivative maturity date     Oct. 01, 2027      
Secured Debt Maturing October 2027 [Member] | Interest Rate Swap [Member] | Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]            
Debt Instrument [Line Items]            
Debt instrument variable interest rate     1.75%      
Secured Debt Maturing January 2030 [Member]            
Debt Instrument [Line Items]            
Debt maturity date Jan. 01, 2030          
Derivative notional amount $ 155,000,000          
Secured Debt Maturing January 2030 [Member] | Interest Rate Swap [Member]            
Debt Instrument [Line Items]            
Derivative notional amount $ 122,700,000          
Derivative, fixed interest rate 2.998%          
Monthly principal amortization $ 650,000          
Secured Debt Maturing January 2030 [Member] | Interest Rate Swap [Member] | Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]            
Debt Instrument [Line Items]            
Debt instrument variable interest rate 1.60%          
Recovery Zone Facility Bonds [Member]            
Debt Instrument [Line Items]            
Debt maturity date     Jan. 01, 2036      
Annual amount of redemption of bonds     $ 4,500,000      
Mandatory bonds redemption beginning period     Jan. 01, 2014      
Mandatory bonds redemption period end date     Dec. 17, 2029      
Total amount of bonds funded     $ 54,400,000     $ 99,700,000