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Note 8 - Leases - Supplemental Balance Sheet Information (Details) - USD ($)
$ in Thousands
Jun. 30, 2019
Jan. 01, 2019
Dec. 31, 2018
Operating Lease, Right-of-Use Asset $ 916,613 $ 926,700 $ 0
Current lease liabilities (included in accrued liabilities) 66,077   0
Operating lease liabilities 850,536   $ 0
Total operating lease liabilities $ 916,613 $ 921,800  
Operating leases (in years) (Year) 19 years 1 month 6 days    
Operating leases 9.20%