CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Cash flows from operating activities:
Net income (loss)	$ 86,629	$ 96,450	$ 114,891
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	177,561	170,038	167,186
Gains on sales of properties	(63,428)	(81,510)	(24,884)
Debt satisfaction gains, net	(6,305)	(3,562)	(25,240)
Impairment charges and loan losses	44,996	100,236	36,832
Straight-line rents	(19,568)	(37,445)	(46,432)
Other non-cash (income) expense, net	8,093	1,656	3,695
Equity in (earnings) losses of non-consolidated entities	848	(7,590)	(1,752)
Distributions of accumulated earnings from non-consolidated entities, net	403	815	2,056
Unearned contingent acquisition consideration	(3,922)	0	0
Deferred taxes, net	0	59	(77)
Increase (decrease) in accounts payable and other liabilities	(1,141)	(1,657)	4,314
Change in rent receivable and prepaid rent, net	2,922	(1,825)	1,967
Increase in accrued interest payable	16	808	2,438
Other adjustments, net	657	(1,200)	9,936
Net cash provided by operating activities:	227,761	235,273	244,930
Cash flows from investing activities:
Investment in real estate, including intangible assets	(558,571)	(167,797)	(349,926)
Investment in real estate under construction	(83,274)	(132,192)	(137,158)
Capital expenditures	(15,184)	(4,408)	(29,110)
Net proceeds from sale of properties	223,853	370,038	156,461
Net proceeds from sale of non-consolidated investment	6,127	0	0
Principal payments received on loans receivable	139,280	2,214	4,746
Investment in loans receivable	0	0	(10,274)
Investments in and advances to non-consolidated entities, net	(9,898)	(37,240)	(18,900)
Distributions from non-consolidated entities in excess of accumulated earnings	531	8,175	1,728
Payments of deferred leasing costs	(6,526)	(6,558)	(6,681)
Change in escrow deposits and restricted cash	23,720	(21,571)	2,745
Change in real estate deposits	20,826	(20,848)	(1,902)
Net cash used in investing activities	(259,116)	(10,187)	(388,271)
Cash flows from financing activities:
Dividends to common and preferred shareholders	(172,101)	(165,858)	(164,737)
Conversion of convertible notes	0	(672)	(529)
Principal amortization payments	(30,082)	(26,796)	(32,440)
Principal payments on debt, excluding normal amortization	(50,797)	(109,973)	(106,956)
Change in revolving credit facility borrowing, net	160,000	(177,000)	177,000
Payment of developer liabilities	0	(4,016)	0
Payments of deferred financing costs	(2,124)	(1,842)	(9,336)
Proceeds of mortgages and notes payable	45,400	254,650	190,843
Proceeds from term loans	95,000	0	0
Change in restricted cash	1,573	0	(1,573)
Cash distributions to noncontrolling interests	(3,242)	(3,404)	(3,688)
Purchase/redemption of a noncontrolling interest	(7,951)	0	(4,022)
Repurchase of common shares	0	(8,973)	(18,431)
Issuance of common shares, net	16,804	12,186	19,382
Net cash provided by (used in) financing activities	52,480	(231,698)	45,513
Change in cash and cash equivalents	21,125	(6,612)	(97,828)
Cash and cash equivalents, at beginning of year	86,637	93,249	191,077
Cash and cash equivalents, at end of year	107,762	86,637	93,249
LCIF [Member]
Cash flows from operating activities:
Net income (loss)	3,559	(3,921)	42,315
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	37,356	34,660	31,145
Gains on sales of properties	(4,491)	(36,380)	0
Debt satisfaction gains, net	0	4,733	33
Impairment charges and loan losses	12,061	72,072	787
Straight-line rents	(4,499)	(26,891)	(35,962)
Other non-cash (income) expense, net	(603)	(1,914)	(2,190)
Equity in (earnings) losses of non-consolidated entities	(476)	(324)	(158)
Distributions of accumulated earnings from non-consolidated entities, net	408	324	150
Increase (decrease) in accounts payable and other liabilities	397	(2,180)	1,129
Change in rent receivable and prepaid rent, net	12	(710)	(316)
Increase in accrued interest payable	18	(269)	(215)
Other adjustments, net	126	(293)	1,692
Net cash provided by operating activities:	43,868	38,907	38,410
Cash flows from investing activities:
Investment in real estate, including intangible assets	(71,272)	(52,700)	(152,000)
Investment in real estate under construction	(20,894)	(31,220)	(20,699)
Capital expenditures	(4,277)	(1,466)	(6,295)
Net proceeds from sale of properties	17,847	238,891	0
Principal payments received on loans receivable	0	0	3,480
Investment in loans receivable	0	0	(318)
Investments in and advances to non-consolidated entities, net	(1,737)	(81)	(1,683)
Distributions from non-consolidated entities in excess of accumulated earnings	854	478	503
Payments of deferred leasing costs	(2,474)	(1,156)	(1,553)
Real estate deposits	(40)	(28)	0
Change in escrow deposits and restricted cash	613	912	(843)
Net cash used in investing activities	(81,380)	153,630	(179,408)
Cash flows from financing activities:
Distributions to partners	(65,489)	(67,113)	(19,741)
Principal amortization payments	(1,054)	(1,311)	(1,454)
Principal payments on debt, excluding normal amortization	0	(23,934)	(28,626)
Payments of deferred financing costs	(875)	(79)	(1,281)
Proceeds of mortgages and notes payable	45,400	0	139,193
Related party note payment	0	0	(8,250)
Co-borrower debt borrowings (payments), net	180,000	(58,000)	0
Related party advances, net	8,389	(9,199)	71,959
Redemption of noncontrolling interests	(129,990)	0	0
Net cash provided by (used in) financing activities	36,381	(159,636)	151,800
Change in cash and cash equivalents	(1,131)	32,901	10,802
Cash and cash equivalents, at beginning of year	52,031	19,130	8,328
Cash and cash equivalents, at end of year	$ 50,900	$ 52,031	$ 19,130