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Short-Term and Long-Term Debt, Including Finance Leases - Credit Facility (Narrative) (Details) - USD ($)
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Debt Instrument [Line Items]      
Credit Facility $ 209,000,000 $ 238,604,000  
Credit facility, amount outstanding $ 209,000,000    
Line of credit facility, collateral, capital stock, percent 100.00%    
Debt instrument, maximum senior secured leverage ratio 4.5    
Short-term borrowings $ 14,813,000 27,048,000  
Interest expense, debt 19,809,000 10,966,000 $ 6,983,000
Interest paid 18,914,000 $ 9,500,000 $ 5,631,000
Australian Borrower      
Debt Instrument [Line Items]      
Line of credit facility, current borrowing capacity 75,000,000    
Maximum      
Debt Instrument [Line Items]      
Lessee leasing arrangements, finance leases, term of contract   24 months  
Minimum      
Debt Instrument [Line Items]      
Lessee leasing arrangements, finance leases, term of contract   60 months  
Letter of credit subcommitment      
Debt Instrument [Line Items]      
Line of credit facility, current borrowing capacity 125,000,000    
Line of credit facility, remaining borrowing capacity 8,852,000    
Credit Facility      
Debt Instrument [Line Items]      
Line of credit facility, current borrowing capacity $ 450,000,000    
Debt instrument, basis spread on variable rate (percent) 0.50%    
Line of credit facility, remaining borrowing capacity $ 232,148,000    
Short-term borrowings $ 14,727,000 $ 26,966,000  
Weighted average interest rates 6.60% 3.30% 2.20%
Credit Facility | UK Borrower      
Debt Instrument [Line Items]      
Line of credit facility, current borrowing capacity $ 250,000,000    
Credit Facility | Canadian Borrower      
Debt Instrument [Line Items]      
Line of credit facility, current borrowing capacity $ 125,000,000    
Credit Facility | Maximum | Base Rate      
Debt Instrument [Line Items]      
Debt instrument, basis spread on variable rate (percent) 0.625%    
Credit Facility | Maximum | Eurocurrency Rate      
Debt Instrument [Line Items]      
Debt instrument, basis spread on variable rate (percent) 1.625%    
Credit Facility | Minimum | Base Rate      
Debt Instrument [Line Items]      
Debt instrument, basis spread on variable rate (percent) 0.00%    
Credit Facility | Minimum | Eurocurrency Rate      
Debt Instrument [Line Items]      
Debt instrument, basis spread on variable rate (percent) 1.00%