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Note 1 - Description of Business and Summary of Significant Accounting Policies - Disposal of Assets and Purchase of Property and Equipment (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Proceeds from sale of assets $ 8,967 $ 90,927 $ 44,234
Proceeds from Repack (Note 1) 14,217 84
Net book value of assets disposed (6,779) (16,811) (44,563)
Total 16,405 74,200 (329)
Recurring purchases - operations 40,983 31,692 43,604
Repack 27,081 2,824
Repack related 1,911  
Total $ 69,975 $ 34,516 $ 43,604