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Cash Flow Information
12 Months Ended
Dec. 31, 2014
Supplemental Cash Flow Information [Abstract]  
Cash Flow Information
CASH FLOW INFORMATION
We consider all highly liquid investments with a maturity of three months or less as of the date of purchase to be cash equivalents unless the investments are legally or contractually restricted for more than three months. We had non-cash investing and financing activities primarily related to increases in property acquired under capital leases of $11.6 million during 2014, $18.0 million during 2013, and $82.2 million during 2012. We also had accrued purchases of property and equipment of $16.3 million at December 31, 2014, $28.1 million at December 31, 2013, and $23.6 million at December 31, 2012. The effect of non-cash transactions is excluded from the accompanying Consolidated Statements of Cash Flows.
We made interest payments of $136.4 million in 2014, $136.0 million in 2013, and $119.6 million in 2012, including interest on vehicle inventory financing. We made income tax payments, net of income tax refunds, of $225.0 million in 2014, $200.3 million in 2013, and $147.0 million in 2012.