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Cash Flow Information	12 Months Ended
	Dec. 31, 2017
Supplemental Cash Flow Information [Abstract]
Cash Flow Information	CASH FLOW INFORMATION We had non-cash investing and financing activities primarily related to increases in property acquired under capital leases of $11.5 million during 2017 and $27.3 million during 2015. We had non-cash investing and financing activities of $3.3 million and $47.2 million related to capital leases and deferred purchase price commitments associated with our 2017 and 2016 acquisitions, respectively. We also had accrued purchases of property and equipment of $48.5 million at December 31, 2017, $29.1 million at December 31, 2016, and $25.3 million at December 31, 2015. We made interest payments, net of amounts capitalized and including interest on vehicle inventory financing, of $205.9 million in 2017, $183.9 million in 2016, and $135.3 million in 2015. We made income tax payments, net of income tax refunds, of $127.0 million in 2017, $265.5 million in 2016, and $278.8 million in 2015.

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- Definition

The entire disclosure for supplemental cash flow activities, including cash, noncash, and part noncash transactions, for the period. Noncash is defined as information about all investing and financing activities of an enterprise during a period that affect recognized assets or liabilities but that do not result in cash receipts or cash payments in the period. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or cash payments in the period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-URI http://asc.fasb.org/topic&trid=2134446

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- References

No definition available.

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