Quarterly Financial Data of the Company (Unaudited) - Narrative (Details) - USD ($) $ in Thousands	1 Months Ended						3 Months Ended						12 Months Ended
	Sep. 30, 2016	Aug. 31, 2016	Jun. 30, 2016	Jan. 31, 2016	Oct. 31, 2015	Sep. 30, 2015	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Mar. 31, 2015	Dec. 31, 2016	Dec. 31, 2015
Disposal Group, Disposed of by Sale, Not Discontinued Operations [Member]
Gain on sale of assets and interests in unconsolidated entities													$ 6,305	$ 106,721
Fort Myers [Member] | Disposal Group, Disposed of by Sale, Not Discontinued Operations [Member]
Gain on sale of assets and interests in unconsolidated entities				$ 4,887					$ 4,900
Myrtle Beach Hwy 501 [Member] | Disposal Group, Disposed of by Sale, Not Discontinued Operations [Member]
Gain on sale of assets and interests in unconsolidated entities	$ 1,418						$ 1,400
Kittery I & II, Tuscola, & West Branch [Member] | Disposal Group, Disposed of by Sale, Not Discontinued Operations [Member]
Gain on sale of assets and interests in unconsolidated entities						$ 20,215					$ 20,200
Barstow [Member] | Disposal Group, Disposed of by Sale, Not Discontinued Operations [Member]
Gain on sale of assets and interests in unconsolidated entities					$ 86,506					$ 86,500
Westgate [Member]
Gain on previously held interest in acquired joint ventures			$ 49,300					$ 49,300
Savannah [Member]
Gain on previously held interest in acquired joint ventures		$ 46,300					$ 46,300
Wisconsin Dells [Member]
Gain on sale of assets and interests in unconsolidated entities												$ 13,700