SEGMENTS (Summary of Segment Operating Results) (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2018 USD ($) segment	Mar. 31, 2017 USD ($)
Segments reporting
Number of reportable segments | segment	3
Total revenues	$ 161,679	$ 231,762
Total operating expenses:	159,140	187,110
Operating income before other items	2,539	44,652
Depreciation and amortization	(28,188)	(25,524)
Equity in earnings from Real Estate and Other Affiliates	14,386	8,520
Gains on sales of properties	0	32,215
Segment EBT	2,392	15,356
Net income	1,834	5,659
Net income attributable to noncontrolling interests	(360)	0
Net income attributable to common stockholders	1,474	5,659
Operating
Segments reporting
Total revenues	91,258
MPC
Segments reporting
Total revenues	55,765
Strategic
Segments reporting
Total revenues	14,656
Operating Segments
Segments reporting
Total revenues	161,679	231,762
Total operating expenses:	93,941	143,632
Operating income before other items	67,738	88,130
Depreciation and amortization	(26,319)	(23,549)
Interest (expense) income, net	(2,771)	(4,363)
Equity in earnings from Real Estate and Other Affiliates	14,382	8,520
Gains on sales of properties	0	32,215
Segment EBT	53,030	100,953
Operating Segments | Operating
Segments reporting
Total revenues	91,258	82,087
Total operating expenses:	44,806	40,237
Operating income before other items	46,452	41,850
Depreciation and amortization	(25,173)	(22,789)
Interest (expense) income, net	(16,687)	(14,524)
Equity in earnings from Real Estate and Other Affiliates	2,583	3,385
Gains on sales of properties	0
Segment EBT	7,175	7,922
Operating Segments | MPC
Segments reporting
Total revenues	55,765	68,706
Total operating expenses:	36,368	35,265
Operating income before other items	19,397	33,441
Depreciation and amortization	(81)	(92)
Interest (expense) income, net	6,392	5,557
Equity in earnings from Real Estate and Other Affiliates	11,128	5,280
Gains on sales of properties	0	0
Segment EBT	36,836	44,186
Operating Segments | Strategic
Segments reporting
Total revenues	14,656	80,969
Total operating expenses:	12,767	68,130
Operating income before other items	1,889	12,839
Depreciation and amortization	(1,065)	(668)
Interest (expense) income, net	7,524	4,604
Equity in earnings from Real Estate and Other Affiliates	672	(145)
Gains on sales of properties	0	32,215
Segment EBT	9,020	48,845
Corporate expenses and other items
Segments reporting
Corporate expenses and other items	$ 51,196	$ 95,294