CONSOLIDATING FINANCIAL STATEMENTS (Detail 3) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Cash flows from operating activities
Net income	$ 109,112	$ 58,196
Adjustment to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	69,993	62,433
Provision for impairment on real estate properties	7,638	34,558
Provision for uncollectible accounts	2,404	5,124
Amortization of deferred financing and refinancing costs	2,502	2,430
Accretion of direct financing leases	(3,016)	(2,921)
Stock-based compensation expense	3,744	2,778
Gain on assets sold - net	(7,420)	(1,571)
Amortization of acquired in-place leases - net	(3,096)	(4,300)
Effective yield receivable on mortgage notes	(593)	(819)
Change in operating assets and liabilities - net:
Accounts receivable	(21,377)	560
Straight-line rent receivables	(11,747)	(9,947)
Lease inducements	447	647
Other operating assets and liabilities	(34,653)	(19,989)
Net cash provided by (used in) operating activities	113,938	127,179
Cash flows from investing activities
Acquisition of real estate	(7,574)	(416,104)
Investments in construction in progress	(15,703)	(16,316)
Deposit to acquire real estate		(113,816)
Investments in direct financing leases	(2,229)
Placement of mortgage loans	(5,749)	(6,162)
Distributions from unconsolidated joint venture	8,587
Proceeds from sale of real estate investments	45,848	2,392
Capital improvements to real estate investments	(8,199)	(9,544)
Proceeds from other investments	23,181	1,461
Investments in other investments	(22,144)	(116,003)
Collection of mortgage principal	333	312
Net cash used in investing activities	16,351	(673,780)
Cash flows from financing activities
Proceeds from credit facility borrowings	148,000	670,000
Payments on credit facility borrowings	(215,000)	(370,000)
Receipts of other long-term borrowings		350,000
Payments of other long-term borrowings	(318)	(309)
Payments of financing related costs	(563)	(3,576)
Receipts from dividend reinvestment plan	7,335	19,596
Payments for exercised options and restricted stock	(2,120)	(2,381)
Gross proceeds from issuance of common stock	6,759
Dividends paid	(122,272)	(107,500)
Redemption of OP Units	(56)	(10)
Distributions to OP Unit Holders	(5,554)	(5,131)
Net cash provided by (used in) financing activities	(183,789)	550,689
Effect of foreign currency translation on cash and cash equivalents	162	(105)
(Decrease) increase in cash and cash equivalents	(53,338)	3,983
Cash and cash equivalents at beginning of period	93,687	5,424
Cash and cash equivalents at end of period	40,349	9,407
Issuer & Subsidiary Guarantors
Cash flows from operating activities
Net income	109,112	58,234
Adjustment to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	64,275	57,279
Provision for impairment on real estate properties	7,638	34,340
Provision for uncollectible accounts	2,404	1,862
Amortization of deferred financing and refinancing costs	2,497	2,424
Accretion of direct financing leases	(3,016)	(2,921)
Stock-based compensation expense	3,744	2,778
Gain on assets sold - net	(7,420)	(1,571)
Amortization of acquired in-place leases - net	(3,096)	(4,300)
Effective yield receivable on mortgage notes	(593)	(819)
Equity in earnings	(4,115)
Change in operating assets and liabilities - net:
Accounts receivable	(21,377)	581
Straight-line rent receivables	(10,444)	(9,111)
Lease inducements	447	647
Other operating assets and liabilities	(32,990)	(10,793)
Net cash provided by (used in) operating activities	107,066	128,630
Cash flows from investing activities
Acquisition of real estate	(7,574)	(401,700)
Investments in construction in progress	(15,703)	(16,316)
Investments in U.K. subsidiaries	4,807	(127,239)
Investments in direct financing leases	(2,229)
Placement of mortgage loans	(5,749)	(6,162)
Distributions from unconsolidated joint venture	8,587
Proceeds from sale of real estate investments	45,848	2,392
Capital improvements to real estate investments	(8,199)	(9,004)
Proceeds from other investments	23,181	1,461
Investments in other investments	(22,144)	(116,003)
Collection of mortgage principal	333	312
Net cash used in investing activities	21,158	(672,259)
Cash flows from financing activities
Proceeds from credit facility borrowings	148,000	670,000
Payments on credit facility borrowings	(215,000)	(370,000)
Receipts of other long-term borrowings		350,000
Payments of financing related costs	(563)	(3,552)
Receipts from dividend reinvestment plan	7,335	19,596
Payments for exercised options and restricted stock	(2,120)	(2,381)
Gross proceeds from issuance of common stock	6,759
Dividends paid	(122,272)	(107,500)
Redemption of OP Units	(56)	(10)
Distributions to OP Unit Holders	(5,554)	(5,131)
Net cash provided by (used in) financing activities	(183,471)	551,022
(Decrease) increase in cash and cash equivalents	(55,247)	7,393
Cash and cash equivalents at beginning of period	87,098	1,592
Cash and cash equivalents at end of period	31,851	8,985
Non-Guarantor Subsidiaries
Cash flows from operating activities
Net income	4,115	(720)
Adjustment to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	5,718	5,154
Provision for impairment on real estate properties		218
Provision for uncollectible accounts		3,262
Amortization of deferred financing and refinancing costs	5	6
Change in operating assets and liabilities - net:
Accounts receivable		(21)
Straight-line rent receivables	(1,303)	(836)
Other operating assets and liabilities	(1,663)	(8,514)
Net cash provided by (used in) operating activities	6,872	(1,451)
Cash flows from investing activities
Acquisition of real estate		(14,404)
Deposit to acquire real estate		(113,816)
Investments in U.K. subsidiaries		127,239
Capital improvements to real estate investments		(540)
Net cash used in investing activities		(1,521)
Cash flows from financing activities
Payments of other long-term borrowings	(318)	(309)
Payments of financing related costs		(24)
Contributions from affiliates	(4,807)
Net cash provided by (used in) financing activities	(5,125)	(333)
Effect of foreign currency translation on cash and cash equivalents	162	(105)
(Decrease) increase in cash and cash equivalents	1,909	(3,410)
Cash and cash equivalents at beginning of period	6,589	3,832
Cash and cash equivalents at end of period	8,498	422
Elimination
Cash flows from operating activities
Net income	(4,115)	682
Adjustment to reconcile net income to net cash provided by operating activities:
Equity in earnings	4,115
Change in operating assets and liabilities - net:
Other operating assets and liabilities		$ (682)
Cash flows from investing activities
Investments in U.K. subsidiaries	(4,807)
Net cash used in investing activities	(4,807)
Cash flows from financing activities
Contributions from affiliates	4,807
Net cash provided by (used in) financing activities	$ 4,807