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Note 8 - Leases - Maturity of Lease Liabilities (Details) - USD ($)
$ in Thousands
Jun. 30, 2019
Dec. 31, 2018
Last two quarters of 2019 $ 68,903  
2020 140,002  
2021 127,591  
2022 113,919  
2023 111,970  
Thereafter 1,377,613  
Total lease payments 1,939,998  
Less imputed interest (1,023,385)  
Less current portion (included in accrued liabilities) (66,077) $ 0
Operating lease liabilities $ 850,536 $ 0