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Cash Flow Information	9 Months Ended
Cash Flow Information	Sep. 30, 2017
Supplemental Cash Flow Information [Abstract]
Cash Flow Information	CASH FLOW INFORMATION We had non-cash investing and financing activities of $3.3 million related to capital leases and deferred purchase price commitments associated with our 2017 acquisitions for the nine months ended September 30, 2017. We also had non-cash investing and financing activities related to increases in property acquired under capital leases of $7.7 million during the nine months ended September 30, 2017. We had non-cash investing and financing activities of $36.3 million related to increases in property acquired under capital leases during the nine months ended September 30, 2016. In addition, we had accrued purchases of property and equipment of $22.7 million at September 30, 2017 and $14.5 million at September 30, 2016. We made interest payments, net of amounts capitalized and including interest on vehicle inventory financing, of $148.6 million during the nine months ended September 30, 2017, and $133.0 million during the nine months ended September 30, 2016. We made income tax payments, net of income tax refunds, of $126.3 million during the nine months ended September 30, 2017, and $193.3 million during the nine months ended September 30, 2016.