Notes Payable - Contractual Obligations for Principal Payments (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Debt Disclosure [Abstract]
2017	$ 40,151
2018	46,807
2019	24,307
2021	13,771
2022	404
Thereafter	17,441
Total contractual obligations for principal payments	142,881
Unamortized premium	238
Total debt	143,119	$ 178,692
Deferred financing fees, net	787	1,656
Notes payable, net of deferred financing fees	$ 142,332	$ 177,036