Supplemental Cash Flow Information (Tables)

3 Months Ended

Mar. 31, 2012

Supplemental Cash Flow Elements [Abstract]

Supplemental cash flow information

	Three months ended March 31,
	2012		2011
	(In thousands)
Interest paid	$	37,325	31,429
Income taxes paid	$	4,183	5,110
Changes in accounts payable related to purchases of revenue earning equipment	$	316,457	134,806
Operating and revenue earning equipment acquired under capital leases	$	59	1,153