Other Assets (Details) - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]
Retained interest investments	$ 10,078	$ 9,932
Accounts receivable, net	4,404	4,385
Prepaid expenses	5,993	4,783
Straight line rent	3,487	2,869
Income tax receivable	921	778
Other assets	6,060	6,305
Accrued interest receivable for Senior Notes held by special purpose entity	3,008	2,938
Total other assets	$ 33,951	$ 31,990