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13. Leases (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Dec. 31, 2020
Lessee, Lease, Description [Line Items]          
Operating Lease, Cost $ 13,700 $ 13,400 $ 40,200 $ 38,400  
Finance Lease, Right-of-Use Asset, Amortization 100 100 400 400  
Finance Lease, Interest Expense 200 200 600 600  
Finance Lease Cost 300 300 1,000 1,000  
Sublease Income 700 700 2,200 2,200  
Operating Lease, Payments 7,200 10,800 30,900 33,000  
Finance Lease, Interest Payment on Liability 100 100 400 400  
Finance Lease, Principal Payments 200 200 600 600  
Right-of-Use Asset Obtained in Exchange for Operating Lease Liability 5,800 800 12,300 8,400  
Right-of-Use Asset Obtained in Exchange for Finance Lease Liability 0 $ 100 0 $ 200  
Operating lease right-of-use assets 204,191   204,191   $ 202,136
Current operating lease liabilities 36,062   36,062   36,507
Operating lease liabilities 176,818   176,818   175,128
Operating Lease, Liability 212,900   212,900   211,600
Finance Lease, Right-Of-Use Asset, before Accumulated Amortization 12,200   12,200   12,200
Finance Lease, Right-Of-Use Asset, Accumulated Amortization 5,400   5,400   5,000
Finance Lease, Right-Of-Use Asset, after Accumulated Amortization 6,800   6,800   7,200
Finance Lease, Liability, Current 500   500   500
Finance Lease, Liability, Noncurrent 10,600   10,600   11,000
Finance Lease, Liability $ 11,100   $ 11,100   $ 11,500
Operating Lease, Weighted Average Remaining Lease Term 8 years   8 years   8 years
Finance Lease, Weighted Average Remaining Lease Term 16 years   16 years   16 years
Operating Lease, Weighted Average Discount Rate, Percent 3.80%   3.80%   3.90%
Finance Lease, Weighted Average Discount Rate, Percent 6.20%   6.20%   6.20%
Lessee, Operating Lease, Liability, Payments, Remainder of Fiscal Year $ 11,400   $ 11,400    
Finance Lease, Liability, Payments, Remainder of Fiscal Year 400   400    
Lessee, Operating Lease, Liability, to be Paid, Year One 43,000   43,000    
Finance Lease, Liability, to be Paid, Year One 1,300   1,300    
Lessee, Operating Lease, Liability, Payments, Due Year Two 37,500   37,500    
Finance Lease, Liability, Payments, Due Year Two 1,200   1,200    
Lessee, Operating Lease, Liability, Payments, Due Year Three 30,900   30,900    
Finance Lease, Liability, Payments, Due Year Three 1,100   1,100    
Lessee, Operating Lease, Liability, Payments, Due Year Four 27,700   27,700    
Finance Lease, Liability, Payments, Due Year Four 1,100   1,100    
Lessee, Operating Lease, Liability, Payments, Due after Year Five 101,500   101,500    
Finance Lease, Liability, Payments, Due after Year Five 14,000   14,000    
Lessee, Operating Lease, Liability, Payments, Due 252,000   252,000    
Finance Lease, Liability, Payment, Due 19,100   19,100    
Lessee, Operating Lease, Liability, Undiscounted Excess Amount (39,100)   (39,100)    
Finance Lease, Liability, Undiscounted Excess Amount (8,000)   (8,000)    
Current liability          
Lessee, Lease, Description [Line Items]          
Current operating lease liabilities $ 36,100   $ 36,100   $ 36,500
Minimum [Member]          
Lessee, Lease, Description [Line Items]          
Lessee Operating And Finance Leases Remaining Lease Term     1 year    
Maximum [Member]          
Lessee, Lease, Description [Line Items]          
Lessee Operating And Finance Leases Remaining Lease Term     18 years