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Long-Term Debt (Narrative) (Details) - USD ($)
1 Months Ended 12 Months Ended
Dec. 31, 2019
Jun. 30, 2021
Sep. 30, 2017
Sep. 27, 2025
Sep. 28, 2024
Dec. 31, 2010
Debt Instrument [Line Items]            
Property and equipment with undepreciated cost pledge as collateral for long term debt       $ 241,700,000    
Debt Instrument, Variable Interest Rate, Type [Extensible Enumeration]       us-gaap:SecuredOvernightFinancingRateSofrOvernightIndexSwapRateMember    
Line of Credit [Member]            
Debt Instrument [Line Items]            
Line of credit facility borrowing capacity       $ 150,000,000.0    
Borrowings outstanding       $ 0    
Derivative maturity date       Jun. 01, 2030    
Letter of Credit [Member]            
Debt Instrument [Line Items]            
Line of credit facility borrowing capacity       $ 10,000,000.0    
Borrowings outstanding       500,000    
Cash Flow Hedging [Member]            
Debt Instrument [Line Items]            
Other comprehensive income (loss), net of income taxes       (1,100,000) $ 6,500,000  
Unrealized gains included in other assets       $ 7,400,000 $ 8,900,000  
Interest Rate Swap [Member]            
Debt Instrument [Line Items]            
Derivative, fixed interest rate       3.962%    
Senior Notes, Maturing 2031 [Member]            
Debt Instrument [Line Items]            
Debt instrument principal amount   $ 350,000,000.0        
Debt instrument stated interest rate   4.00%   4.00%    
Maturity period of senior notes   2031        
Senior Notes, Maturing 2031 [Member] | May Redeem Prior to June 15, 2026 [Member]            
Debt Instrument [Line Items]            
Debt instrument, redemption price as percentage of principal amount       100.00%    
Senior Notes, Maturing 2031 [Member] | May Redeem Prior to June 15, 2024 [Member]            
Debt Instrument [Line Items]            
Debt instrument, redemption price as percentage of principal amount       104.00%    
Debt instrument redemption percentage       40.00%    
Debt instrument redemption percentage outstanding       60.00%    
Secured Debt Maturing October 2027 [Member]            
Debt Instrument [Line Items]            
Debt maturity date     Oct. 01, 2027      
Secured borrowing     $ 60,000,000      
Secured Debt Maturing October 2027 [Member] | Interest Rate Swap [Member]            
Debt Instrument [Line Items]            
Derivative notional amount       $ 12,500,000    
Derivative, fixed interest rate       3.962%    
Derivative basis spread       1.75%    
Monthly principal amortization       $ 500,000    
Derivative maturity date       Oct. 01, 2027    
Secured Debt Maturing January 2030 [Member]            
Debt Instrument [Line Items]            
Debt instrument principal amount $ 155,000,000          
Debt maturity date Jan. 01, 2030          
Secured Debt Maturing January 2030 [Member] | Interest Rate Swap [Member]            
Debt Instrument [Line Items]            
Derivative notional amount       $ 109,100,000    
Derivative, fixed interest rate       2.998%    
Derivative basis spread       1.60%    
Monthly principal amortization       $ 650,000    
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           $ 99,700,000