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Note 7 - Leases - Maturity of Lease Liabilities (Details) - USD ($)
$ in Thousands
Mar. 31, 2020
Dec. 31, 2019
Last three quarters of 2020 $ 122,305  
2021 148,397  
2022 119,999  
2023 112,274  
2024 112,068  
Thereafter 1,273,348  
Total lease payments 1,888,391  
Less imputed interest (968,508)  
Operating lease liabilities 828,466 $ 840,285
Accrued Liabilities [Member]    
Less current portion (included in accrued liabilities) $ (91,417) $ (87,686)