Equity Method Investment (Details)	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2017 USD ($)	Jun. 30, 2016 USD ($)	Jun. 30, 2017 USD ($)	Jun. 30, 2016 USD ($)	Dec. 31, 2016 USD ($)	Feb. 25, 2016 story
Schedule of Equity Method Investments [Line Items]
Equity method investments	$ 10,950,000		$ 10,950,000		$ 10,235,000
Long-term Debt	465,291,000		465,291,000		522,180,000
22-Story Mixed Use Tower | City Center
Schedule of Equity Method Investments [Line Items]
Interests in equity method investments						37.00%
Number stories in the mixed use tower (story) | story						22
Equity method investments	11,000,000		11,000,000		10,300,000
Guarantee of construction loan						37.00%
Assets being used as collateral for the construction loan						100.00%
Dividends from equity investment	0	$ 0	0	$ 0
Income from equity method investment			0		$ 0
Long-term Debt	5,500,000		5,500,000
City Center | 22-Story Mixed Use Tower | City Center
Schedule of Equity Method Investments [Line Items]
Long-term Debt	$ 10,800,000		$ 10,800,000