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Leases (Tables)
 12 Months Ended
Dec. 31, 2020
Leases [Abstract]  
Lease, Cost [Table Text Block] The following table summarizes the Company's lease costs for the years ended December 31, 2020 and 2019, and other information:
Year ended
December 31,
2020		December 31,
2019
Lease cost
Finance lease cost:
Amortization of leased assets$1,560 $1,019 
Interest on leased liabilities197 129 
Operating lease cost50,561 44,403 
Short-term lease cost8,921 9,958 
Variable lease cost339,148 339,923 
Sublease income(1,628)(1,634)
Total lease cost$398,759 $393,798 
Other information
Cash paid for amounts included in the measurement of lease liabilities:
Operating cash flows from finance leases$197 $129 
Operating cash flows from operating leases$50,263 $44,328 
Financing cash flows from finance leases$1,446 $946 
Leased assets obtained in exchange for finance lease obligations$1,927 $8,188 
Right-of-use assets obtained in exchange for operating lease liabilities$72,454 $181,069 
Weighted-average remaining lease term - finance leases (in years)4.04.6
Weighted-average remaining lease term - operating leases (in years)3.73.7
Weighted-average discount rate - finance leases3.1 %3.4 %
Weighted-average discount rate - operating leases3.2 %3.4 %
Contractual Obligation, Fiscal Year Maturity Schedule [Table Text Block]
The aggregate future minimum lease payments under noncancelable operating and finance leases with remaining terms greater than one year as of December 31, 2020 were as follows:

Payment Due PeriodOperating LeasesFinance Leases
2021$48,748 $1,979 
202236,035 1,775 
202326,414 1,633 
202419,140 1,220 
20259,560 612 
Thereafter9,548 5 
Total minimum lease payments149,445 7,224 
Less: imputed interest(25,419)(413)
Present value of future minimum lease payments124,026 6,811 
Less: current portion of lease obligations(43,680)(1,801)
Long-term lease obligations$80,346 $5,010