Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Cash Flows — Operating Activities
Net income	$ 424,341	$ 285,083	$ 274,807
Adjustments to net income:
Depreciation and amortization, including intangible assets and deferred financing costs	298,166	261,415	279,693
Gain on sale of real estate	(118,605)	(33,878)	(71,318)
Distributions of earnings from equity method investments	62,015	66,259	64,650
Equity in earnings of equity method investments in the Managed Programs and real estate	(61,514)	(64,750)	(64,719)
Amortization of rent-related intangibles and deferred rental revenue	51,132	55,051	3,322
Investment Management revenue received in shares of Managed REITs and other	(49,110)	(69,658)	(31,786)
Gain on change in control of interests	(47,814)	0	0
Straight-line rent adjustments	(21,994)	(16,980)	(17,836)
Stock-based compensation expense	18,294	18,917	21,222
Realized and unrealized (gains) losses on foreign currency transactions, derivatives, and other	(17,644)	16,879	4,458
Deferred income taxes	(6,279)	(20,013)	(21,444)
Impairment charges	4,790	2,769	59,303
Allowance for credit losses	0	0	7,064
Changes in assets and liabilities:
Net changes in other operating assets and liabilities	(28,054)	9,390	27,637
Deferred structuring revenue received	9,456	16,705	20,695
Increase in deferred structuring revenue receivable	(8,014)	(6,530)	(8,951)
Net Cash Provided by Operating Activities	509,166	520,659	546,797
Cash Flows — Investing Activities
Purchases of real estate	(719,548)	(31,842)	(531,694)
Proceeds from sales of real estate	431,626	159,933	542,422
Cash and restricted cash acquired in connection with the CPA:17 Merger	113,634	0	0
Funding for real estate construction, redevelopments, and other capital expenditures on real estate	(107,684)	(78,367)	(64,441)
Proceeds from repayment of short-term loans to affiliates	37,000	277,894	37,053
Capital contributions to equity method investments	(18,173)	(1,291)	(147)
Return of capital from equity method investments	16,382	10,085	6,498
Funding of short-term loans to affiliates	(10,000)	(123,492)	(257,500)
Other investing activities, net	(7,681)	1,318	(847)
Cash paid to stockholders of CPA:17 – Global in the CPA:17 Merger	(1,688)	0	0
Deconsolidation of affiliate (Note 2)	0	0	(15,408)
Investment in assets of affiliate (Note 2)	0	0	(14,861)
Proceeds from limited partnership units issued by affiliate (Note 2)	0	0	14,184
Net Cash (Used in) Provided by Investing Activities	(266,132)	214,238	(284,741)
Cash Flows — Financing Activities
Repayments of Senior Unsecured Credit Facility	(2,108,629)	(1,680,198)	(954,006)
Proceeds from Senior Unsecured Credit Facility	1,403,254	1,302,463	1,154,157
Proceeds from issuance of Senior Unsecured Notes	1,183,828	530,456	348,887
Dividends paid	(440,431)	(431,182)	(416,655)
Proceeds from shares issued under “at-the-market” offering, net of selling costs	287,544	22,824	84,063
Prepayments of mortgage principal	(207,450)	(193,434)	(327,477)
Scheduled payments of mortgage principal	(100,433)	(344,440)	(170,979)
Distributions paid to noncontrolling interests	(18,216)	(20,643)	(17,030)
Payments for withholding taxes upon delivery of equity-based awards and exercises of stock options	(13,985)	(11,969)	(16,291)
Payment of financing costs	(8,059)	(12,675)	(3,619)
Other financing activities, net	(1,465)	(1,301)	2,646
Repurchase of shares in connection with CPA:17 Merger	(1,178)	0	0
Proceeds from mortgage financing	857	4,083	33,935
Contributions from noncontrolling interests	71	90,550	346
Net Cash Used in Financing Activities	(24,292)	(745,466)	(282,023)
Change in Cash and Cash Equivalents and Restricted Cash During the Year
Effect of exchange rate changes on cash and cash equivalents and restricted cash	(4,355)	9,514	(7,336)
Net increase (decrease) in cash and cash equivalents and restricted cash	214,387	(1,055)	(27,303)
Cash and cash equivalents and restricted cash, beginning of year	209,676	210,731	238,034
Cash and cash equivalents and restricted cash, end of year	$ 424,063	$ 209,676	$ 210,731