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Supplemental Cash Flow Information - Summary (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Supplemental Cash Flow Elements [Abstract]      
Interest paid $ 225,842 $ 161,826 $ 129,559
Income taxes paid 6,325 22,965 13,692
Changes in accounts payable related to purchases of revenue earning equipment $ (114,751) $ 114,862 $ 80,781