Debt (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2014	Dec. 31, 2013	Dec. 31, 2007
Debt Instrument [Line Items]
Long term debt	$ 60,678	$ 44,217
In-substance defeased debt, interest payable monthly at 5.62% at September 30, 2014 and December 31, 2013, secured and paid by pledged treasury securities, due October 1, 2015
Debt Instrument [Line Items]
Long term debt	25,822	26,260	29,300
Community Development District debt, secured by certain real estate and standby note purchase agreements, due May 2016 — May 2039, bearing interest at 2.25% to 7.0% at September 30, 2014 and December 31, 2013 | Community Development District debt, secured by certain real estate and standby note purchase agreements, due May 2016 — May 2039, bearing interest at 2.25% to 7.0% at September 30, 2014 and December 31, 2013
Debt Instrument [Line Items]
Long term debt	5,934	11,512
Construction loan in the Pier Park North joint venture, due February 2016, bearing interest at LIBOR plus 210 basis points, or 2.25% and 2.27% at September 30, 2014 and December 31, 2013, respectively | Pier Park North Joint Venture Construction Loan
Debt Instrument [Line Items]
Long term debt	$ 28,922	$ 6,445