Commitments and Contingencies (Narrative) (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2016	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Aug. 04, 2016
Commitments [Line Items]
Threshold increase for assessed value of real property		$ 1,000
Real property assessed value, bond termination threshold		$ 225,000
Reduction in bond obligation for threshold increase in assessed value for real property		1.00%
Annual bond debt service expense			$ 100
Escrow released		$ (27)	760	$ 3,230
Bonds
Commitments [Line Items]
Threshold for real property assessed value		219,000
Outstanding bond obligation		4,200	$ 4,700
Annual bond debt service		500
Frisco Square
Commitments [Line Items]
Escrow released	$ (1,400)
Frisco Square | Bonds
Commitments [Line Items]
Threshold for real property assessed value		$ 125,000
Reduction in bond obligation for threshold increase in assessed value for real property		3.00%
Annual bond debt service		$ 100
Frisco Square
Commitments [Line Items]
Percentage of net sales to be deposited into an escrow account		33.00%
Limit to which sales proceeds will be deposited to escrow accounts		$ 7,000
Escrow deposit related to land sales		1,400
Chase - The Private Residences
Commitments [Line Items]
Completion guarantee		$ 6,500
Unspent funds required to be put into escrow		125.00%
Escrow related to certain facade repairs and enhancements		$ 2,600			$ 3,100
Required escrow		1,500			$ 1,500
City of Frisco | Bonds
Commitments [Line Items]
Bond proceeds		$ 12,500