Real Estate - Discontinued Operations (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
STATEMENTS OF INCOME
Income from continuing operations of disposed properties, net of income taxes	$ 0	$ 0	$ 1,222
Amounts attributable to noncontrolling interests	0	0	(1,023)
Disposal Group, Not Discontinued Operations [Member]
STATEMENTS OF INCOME
Rental revenues	3,503	21,987	26,374
Expenses	(1,179)	(16,246)	(19,753)
Gain on disposition of properties	81,965	89,063	0
Loss on extinguishment of debt	(15)	(111)	(181)
Provision for income taxes	0	(2)	(2)
Income from continuing operations of disposed properties, net of income taxes	84,274	94,691	6,438
Amounts attributable to noncontrolling interests	$ (64,374)	$ (76,277)	0
Disposal Group, Not Discontinued Operations [Member] | Consolidated Property Sold [Member]
STATEMENTS OF INCOME
Gain on disposition of properties			1,200
Amounts attributable to noncontrolling interests			$ (1,000)