Project Development Costs (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Development Costs [Line Items]
Project development costs incurred		$ 42,900	$ 12,200	$ 18,000
Capitalized project development costs		10,400
Development expenses	$ 16,000	32,514	12,207	18,009
Legal, Construction Manager Costs, Consultants, And Other Professional Services [Member]
Development Costs [Line Items]
Project development costs incurred		2,700	5,100
Agreement Payments [Member]
Development Costs [Line Items]
Project development costs incurred		4,600	3,100	1,500
Architectural, Engineering, Construction Manager, and Subcontractor [Member]
Development Costs [Line Items]
Project development costs incurred		24,200
Capitalized project development costs		10,300
Professional Services [Member]
Development Costs [Line Items]
Project development costs incurred		975	900	900
Architectural Fees [Member]
Development Costs [Line Items]
Project development costs incurred			2,100	10,400
Application Fee [Member]
Development Costs [Line Items]
Project development costs incurred			$ 1,000
Shared Development Expenses [Member]
Development Costs [Line Items]
Project development costs incurred				1,900
Legal Expense [Member]
Development Costs [Line Items]
Project development costs incurred				2,300
Capitalized project development costs		$ 127
Construction Manager Costs [Member]
Development Costs [Line Items]
Project development costs incurred				$ 1,000