Supplemental Cash Flow Information (Tables)

12 Months Ended

Dec. 31, 2017

Supplemental Cash Flow Elements [Abstract]

Supplemental cash flow information

Supplemental cash flow information was as follows:

	Years ended December 31,
	2017		2016		2015
	(In thousands)
Interest paid	$	129,559	143,990		144,973
Income taxes paid	13,692		14,062		13,379
Changes in accounts payable related to purchases of revenue earning equipment	80,781		(142,256	)	28,134
Operating and revenue earning equipment acquired under capital leases	7,057		1,230		5,959