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13. Leases (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Dec. 31, 2020
Lessee, Lease, Description [Line Items]          
Operating Lease, Cost $ 11,800 $ 12,400 $ 23,500 $ 25,000  
Finance Lease, Right-of-Use Asset, Amortization 100 100 300 300  
Finance Lease, Interest Expense 200 200 400 400  
Finance Lease Cost 300 300 700 700  
Sublease Income 700 700 1,500 1,500  
Operating Lease, Payments 11,900 10,900 23,700 22,200  
Finance Lease, Interest Payment on Liability 100 200 300 400  
Finance Lease, Principal Payments 200 100 400 300  
Right-of-Use Asset Obtained in Exchange for Operating Lease Liability 2,300 2,200 6,500 7,600  
Right-of-Use Asset Obtained in Exchange for Finance Lease Liability 0 $ 100 0 $ 100  
Operating lease right-of-use assets 190,233   190,233   $ 202,136
Current operating lease liabilities 35,608   35,608   36,507
Operating lease liabilities 163,914   163,914   175,128
Operating Lease, Liability 199,500   199,500   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 5,300   5,300   5,000
Finance Lease, Right-Of-Use Asset, after Accumulated Amortization 6,900   6,900   7,200
Finance Lease, Liability, Current 500   500   500
Finance Lease, Liability, Noncurrent 10,800   10,800   11,000
Finance Lease, Liability $ 11,300   $ 11,300   $ 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 $ 22,000   $ 22,000    
Finance Lease, Liability, Payments, Remainder of Fiscal Year 600   600    
Lessee, Operating Lease, Liability, to be Paid, Year One 39,700   39,700    
Finance Lease, Liability, to be Paid, Year One 1,300   1,300    
Lessee, Operating Lease, Liability, Payments, Due Year Two 33,500   33,500    
Finance Lease, Liability, Payments, Due Year Two 1,200   1,200    
Lessee, Operating Lease, Liability, Payments, Due Year Three 26,900   26,900    
Finance Lease, Liability, Payments, Due Year Three 1,200   1,200    
Lessee, Operating Lease, Liability, Payments, Due Year Four 23,400   23,400    
Finance Lease, Liability, Payments, Due Year Four 1,100   1,100    
Lessee, Operating Lease, Liability, Payments, Due after Year Five 91,400   91,400    
Finance Lease, Liability, Payments, Due after Year Five 14,000   14,000    
Lessee, Operating Lease, Liability, Payments, Due 236,900   236,900    
Finance Lease, Liability, Payment, Due 19,400   19,400    
Lessee, Operating Lease, Liability, Undiscounted Excess Amount (37,400)   (37,400)    
Finance Lease, Liability, Undiscounted Excess Amount (8,100)   (8,100)    
Current liability          
Lessee, Lease, Description [Line Items]          
Current operating lease liabilities $ 35,600   $ 35,600   $ 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