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Cash Flow Information (Details) - USD ($)
3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Supplemental Cash Flow Information [Abstract]    
Non-cash investing and financing activities primarily related to capital leases $ 0 $ 5,300,000
Accrued purchases of property and equipment 16,400,000 12,800,000
Interest payments including interest on vehicle inventory financing 36,600,000 31,500,000
Income tax payments, net of income tax refunds $ 900,000 $ 18,400,000