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Note 18 - Other Supplemental Information - Summary of Other Supplemental Information (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Income taxes, net of refunds $ 43,374 $ 36,349
Interest 11,168 7,980
Increases in capital lease obligations 123 988
Dividends declared but not paid 1,947 1,932
Rent expense $ 65,982 $ 57,850