Goodwill and Other Intangible Assets (Details Textual) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Gain (Loss) on Sale of Capital Leases, Net	$ 0	$ (720)	$ 0
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life	5 years
Aggregate Amortization Expense 2018	$ 24,400
Aggregate Amortization Expense 2019	19,600
Aggregate Amortization Expense 2020	15,300
Aggregate Amortization Expense 2021	11,700
Aggregate Amortization Expense 2022	$ 7,900
Pacific Western Equipment Finance [Member]
Goodwill, Subsequent Recognition of Deferred Tax Asset		$ (500)