Lease Agreements (Details) $ in Thousands	Dec. 31, 2017 USD ($) community building
Leases [Abstract]
Number of commercial buildings leased | building	1
Number of commercial portions of mixed use communities leased | community	37
Future minimum non-cancelable base rent under operating leases [Abstract]
2018	$ 13,791
2019	13,257
2020	12,392
2021	10,745
2022	9,486
Thereafter	28,454
Total future minimum rent	$ 88,125