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13. Leases (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Dec. 31, 2020
Lessee, Lease, Description [Line Items]      
Operating Lease, Cost $ 11,700 $ 12,600  
Finance Lease, Right-of-Use Asset, Amortization 100 100  
Finance Lease, Interest Expense 200 200  
Finance Lease Cost 300 300  
Sublease Income 700 700  
Operating Lease, Payments 11,800 11,400  
Finance Lease, Interest Payment on Liability 100 200  
Finance Lease, Principal Payments 200 100  
Right-of-Use Asset Obtained in Exchange for Operating Lease Liability 4,200 10,800  
Right-of-Use Asset Obtained in Exchange for Finance Lease Liability 0 $ 0  
Operating lease right-of-use assets 196,224   $ 202,136
Current operating lease liabilities 39,235   36,507
Operating lease liabilities 168,326   175,128
Operating Lease, Liability 207,600   211,600
Finance Lease, Right-Of-Use Asset, before Accumulated Amortization 12,200   12,200
Finance Lease, Right-Of-Use Asset, Accumulated Amortization 5,100   5,000
Finance Lease, Right-Of-Use Asset, after Accumulated Amortization 7,100   7,200
Finance Lease, Liability, Current 500   500
Finance Lease, Liability, Noncurrent 10,900   11,000
Finance Lease, Liability $ 11,400   $ 11,500
Operating Lease, Weighted Average Remaining Lease Term 8 years   8 years
Finance Lease, Weighted Average Remaining Lease Term 16 years   16 years
Operating Lease, Weighted Average Discount Rate, Percent 3.90%   3.90%
Finance Lease, Weighted Average Discount Rate, Percent 6.20%   6.20%
Lessee, Operating Lease, Liability, Payments, Remainder of Fiscal Year $ 35,300    
Finance Lease, Liability, Payments, Remainder of Fiscal Year 1,000    
Lessee, Operating Lease, Liability, to be Paid, Year One 38,600    
Finance Lease, Liability, to be Paid, Year One 1,300    
Lessee, Operating Lease, Liability, Payments, Due Year Two 32,400    
Finance Lease, Liability, Payments, Due Year Two 1,200    
Lessee, Operating Lease, Liability, Payments, Due Year Three 26,400    
Finance Lease, Liability, Payments, Due Year Three 1,100    
Lessee, Operating Lease, Liability, Payments, Due Year Four 23,100    
Finance Lease, Liability, Payments, Due Year Four 1,100    
Lessee, Operating Lease, Liability, Payments, Due after Year Five 90,600    
Finance Lease, Liability, Payments, Due after Year Five 14,000    
Lessee, Operating Lease, Liability, Payments, Due 246,400    
Finance Lease, Liability, Payment, Due 19,700    
Lessee, Operating Lease, Liability, Undiscounted Excess Amount (38,800)    
Finance Lease, Liability, Undiscounted Excess Amount (8,300)    
Current liability      
Lessee, Lease, Description [Line Items]      
Current operating lease liabilities $ 39,300   $ 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