CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Cash flows from operating activities:
Net income	$ 97,463	$ 3,863	$ 184,638
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	167,289	183,833	171,969
Gain on acquisition	0	0	(167,864)
Gains on sales of properties	(57,507)	(24,472)	(13,291)
Gains on sales of financial assets, net	(855)	0	0
Debt satisfaction charges, net	2,859	3,989	8,062
Impairment charges and loan losses	51,100	48,499	9,969
Straight-line rents	(46,254)	(23,538)	(7,372)
Other non-cash (income) expense, net	(390)	5,248	(1,139)
Equity in (earnings) losses of non-consolidated entities	(626)	157	(21,531)
Distributions of accumulated earnings from non-consolidated entities, net	1,381	918	7,498
Deferred taxes, net	124	752	(186)
Increase (decrease) in accounts payable and other liabilities	(3,716)	6,223	(598)
Change in rent receivable and prepaid rent, net	617	(4,420)	1,325
Decrease in accrued interest payable	(963)	(1,058)	(2,473)
Other adjustments, net	5,384	(2,530)	(2,547)
Net cash provided by operating activities:	214,672	206,304	163,810
Cash flows from investing activities:
Investment in real estate, including intangible assets	(122,395)	(447,571)	(98,083)
Investment in real estate under construction	(131,153)	(106,009)	(113,262)
Capital expenditures	(17,681)	(48,822)	(49,952)
Acquisition of remaining interest in NLS, net of cash acquired of $8,107	0	0	(1,331)
Net proceeds from sale of properties	237,866	75,519	155,240
Principal payments received on loans receivable	44,661	2,056	6,841
Investment in loans receivable	(43,555)	(60,727)	(11,470)
Investments in and advances to non-consolidated entities, net	(2,948)	(8,193)	(20,172)
Proceeds from sale of interest in non-consolidated entity	0	0	7,000
Distributions from non-consolidated entities in excess of accumulated earnings	1,314	15,603	351
Increase in deferred leasing costs	(10,484)	(12,060)	(14,826)
Proceeds from the sale of marketable equity securities	725	0	0
Investment in marketable equity securities	(689)	0	0
Change in escrow deposits and restricted cash	916	(7,141)	5,710
Change in real estate deposits	355	(238)	(149)
Net cash used in investing activities	(43,068)	(597,583)	(134,103)
Cash flows from financing activities:
Dividends to common and preferred shareholders	(159,520)	(135,539)	(103,295)
Repurchase of exchangeable notes	0	0	(62,150)
Proceeds from senior notes	249,708	247,565	0
Conversion of convertible notes	(233)	(3,270)	(2,427)
Principal amortization payments	(35,206)	(34,446)	(31,252)
Principal payments on debt, excluding normal amortization	(202,262)	(347,122)	(288,094)
Change in revolving credit facility borrowing, net	(48,000)	48,000	0
Increase in deferred financing costs	(4,558)	(12,307)	(6,431)
Proceeds of mortgages and notes payable	27,790	253,500	121,000
Proceeds from term loans	99,000	151,000	255,000
Contributions from noncontrolling interests	0	0	889
Cash distributions to noncontrolling interests	(4,008)	(3,870)	(35,381)
Purchase of a noncontrolling interest	(2,100)	(8,918)	0
Repurchase of preferred shares	0	(155,004)	(70,000)
Redemption of noncontrolling interests	(1,962)	0	0
Issuance of common shares, net	23,563	434,927	162,747
Net cash provided by (used in) financing activities	(57,788)	434,516	(59,394)
Change in cash and cash equivalents	113,816	43,237	(29,687)
Cash and cash equivalents, at beginning of year	77,261	34,024	63,711
Cash and cash equivalents, at end of year	$ 191,077	$ 77,261	$ 34,024