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Note 7 - Leases - Supplemental Balance Sheet Information (Details) - USD ($)
$ in Thousands
Mar. 31, 2020
Dec. 31, 2019
Operating lease right-of-use assets $ 928,026 $ 936,170
Operating lease liabilities 828,466 840,285
Total operating lease liabilities $ 919,883 $ 927,971
Operating leases (in years) (Year) 18 years 2 months 12 days 18 years 2 months 12 days
Operating leases 9.00% 8.90%
Accrued Liabilities [Member]    
Current lease liabilities (included in accrued liabilities) $ 91,417 $ 87,686