Revenue Earning Equipment (Details Textual) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Revenue Earning Equipment [Abstract]
Revenue earning equipment depreciation expense	$ 1,160,000	$ 1,100,000	$ 1,040,000
Impact of depreciation acceleration	21,000	10,000
Losses from fair value adjustments	58,065	67,415	$ 17,956
Assets Held-for-sale	$ 42,000	$ 45,000