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Debt (Narrative) (Details) - USD ($)
3 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Feb. 28, 2029
Feb. 28, 2028
Feb. 08, 2028
Feb. 08, 2027
Aug. 08, 2026
Aug. 08, 2025
Feb. 25, 2025
Feb. 08, 2025
Aug. 08, 2024
Feb. 25, 2024
Dec. 31, 2022
Dec. 09, 2022
Feb. 07, 2022
Jul. 30, 2015
Debt Instrument [Line Items]                                
Document Period End Date Mar. 31, 2023                              
Debt Instrument, Interest Rate, Stated Percentage                             0.60%  
Payments of Debt Issuance Costs $ 72,000 $ 86,000                            
Debt issuance costs, net of amortization (2,453,000)                       $ (2,605,000)      
Line of Credit Facility, Remaining Borrowing Capacity 35,000,000                              
Senior Notes 335,920,000                       335,825,000      
Letters of Credit Outstanding, Amount 3,100,000                       5,000,000      
2026 Notes                                
Debt Instrument [Line Items]                                
Senior Notes 75,000,000                       75,000,000      
2027 Notes                                
Debt Instrument [Line Items]                                
Senior Notes 37,500,000                       37,500,000      
2028 Notes                                
Debt Instrument [Line Items]                                
Senior Notes 125,000,000                       125,000,000      
2029 Notes                                
Debt Instrument [Line Items]                                
Senior Notes 100,000,000                       100,000,000      
Senior Notes                                
Debt Instrument [Line Items]                                
Debt issuance costs, net of amortization (1,580,000)                       (1,675,000)      
Revolving Credit Facility [Member]                                
Debt Instrument [Line Items]                                
Line of Credit Facility, Maximum Borrowing Capacity                           $ 325,000,000   $ 35,000,000
Borrowings on lines of credit $ 0                       $ 0      
Forecast [Member]                                
Debt Instrument [Line Items]                                
Long-term Debt, Maturities, Repayments of Principal in Rolling after Year Five     $ 70,000,000 $ 30 $ 25,000,000 $ 25,000,000 $ 50,000,000 $ 12,500,000 $ 25,000,000 $ 25,000,000 $ 12,500,000 $ 25,000,000