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Short-Term and Long-Term Debt, Including Finance Leases - Credit Facility (Narrative) (Details)
12 Months Ended
Dec. 31, 2021
USD ($)
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Debt Instrument [Line Items]      
Line of credit facility, collateral, capital stock, percent   100.00%  
Debt instrument, maximum senior secured leverage ratio 4.50    
Short Term Borrowings $ 10,704,000 $ 1,837,000  
Interest expense, debt 6,983,000 8,187,000 $ 11,519,000
Interest paid 5,631,000 7,152,000 $ 10,470,000
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 11,277,000    
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%    
Credit Facility $ 174,594,000 112,855,000  
Line of credit facility, remaining borrowing capacity 260,242,000    
Short Term Borrowings 10,616,000 $ 1,570,000  
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%