Fair Value of Financial Instruments - Schedule of Fair Values and Carrying Values of Assets and Liabilities (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Fair Value, Inputs, Level 2 | Fair Value
Assets, Fair Value Disclosure [Abstract]
Notes receivable, net	$ 12,375	$ 12,225
Total assets	12,375	12,225
Fair Value, Inputs, Level 2 | Carrying value
Assets, Fair Value Disclosure [Abstract]
Notes receivable, net	12,375	12,225
Total assets	12,375	12,225
Fair Value, Inputs, Level 3
Assets, Fair Value Disclosure [Abstract]
Total assets	33,086	42,474
Liabilities, Fair Value Disclosure [Abstract]
Debt, net	375,085	355,913
Fair Value, Inputs, Level 3 | Fair Value
Liabilities, Fair Value Disclosure [Abstract]
Debt, net	376,960	356,537
Total liabilities	376,960	356,537
Fair Value, Inputs, Level 3 | Carrying value
Liabilities, Fair Value Disclosure [Abstract]
Total liabilities	$ 375,085	$ 355,913