Other Assets - Schedule of Other Assets (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]
Retained interest investments	$ 11,250	$ 11,147
Accounts receivable, net	11,224	8,460
Notes receivable	5,465	9,522
Prepaid expenses	6,680	6,625
Straight line rent	3,805	3,804
Other assets	3,342	4,637
Accrued interest receivable for Senior Notes held by SPE	935	2,938
Total other assets	$ 42,701	$ 47,133