CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Cash flows from operating activities:
Net income	$ 158,365,000	$ 70,205,000	$ 79,383,000
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	113,882,000	68,472,000	63,079,000
Amortization of above and below market lease intangibles, net	(912,000)	0	0
Non-cash interest income adjustments	(769,000)	582,000	626,000
Non-cash interest expense	7,776,000	5,678,000	5,279,000
Stock-based compensation expense	8,359,000	7,496,000	6,123,000
Loss on extinguishment of debt	553,000	556,000	0
Straight-line rental income adjustments	(29,440,000)	(21,984,000)	(24,320,000)
Provision for doubtful accounts and loan losses	17,113,000	5,543,000	12,842,000
Change in fair value of contingent consideration	(426,000)	(1,526,000)	(1,550,000)
Gain on consolidation	0	0	(710,000)
Net (gain) loss on sales of real estate	(52,029,000)	6,122,000	161,000
Impairment of real estate	1,326,000	29,811,000	0
Changes in operating assets and liabilities:
Accounts receivable, prepaid expenses and other assets	(16,734,000)	(1,981,000)	(22,827,000)
Accounts payable and accrued liabilities	(67,257,000)	11,462,000	6,977,000
Restricted cash	(6,321,000)	(3,697,000)	(3,962,000)
Net cash provided by operating activities	133,486,000	176,739,000	121,101,000
Cash flows from investing activities:
Acquisition of real estate	(419,905,000)	(153,579,000)	(461,330,000)
Cash received in CCP Merger	77,859,000	0	0
Origination and fundings of loans receivable	(17,239,000)	(9,675,000)	(49,687,000)
Origination and fundings of preferred equity investments	(2,749,000)	(7,348,000)	(12,804,000)
Additions to real estate	(6,954,000)	(1,003,000)	(3,689,000)
Repayment of loans receivable	32,430,000	215,962,000	5,803,000
Repayment of preferred equity investments	3,755,000	0	0
Release of contingent consideration held in escrow	0	0	5,240,000
Net proceeds from sale of real estate	92,731,000	98,006,000	27,241,000
Net cash (used in) provided by investing activities	(240,072,000)	142,363,000	(489,226,000)
Cash flows from financing activities:
Net proceeds from (repayments of) revolving credit facility	253,000,000	(229,000,000)	187,000,000
Proceeds from term loans	181,000,000	69,360,000	73,242,000
Proceeds from secured debt	0	0	28,735,000
Principal payments on secured debt	(4,145,000)	(14,768,000)	(3,132,000)
Payments of deferred financing costs	(15,337,000)	(5,937,000)	(1,452,000)
Payment of contingent consideration	(382,000)	0	0
Distributions to noncontrolling interests	(30,000)	0	0
Contributions by noncontrolling interests	0	0	179,000
Issuance of common stock, net	366,800,000	(1,289,000)	139,403,000
Dividends paid on common and preferred stock	(182,089,000)	(119,264,000)	(109,897,000)
Net cash provided by (used in) financing activities	598,817,000	(300,898,000)	314,078,000
Net increase (decrease) in cash and cash equivalents	492,231,000	18,204,000	(54,047,000)
Effect of foreign currency translation on cash and cash equivalents	738,000	25,000	(312,000)
Cash and cash equivalents, beginning of period	25,663,000	7,434,000	61,793,000
Cash and cash equivalents, end of period	518,632,000	25,663,000	7,434,000
Supplemental disclosure of cash flow information:
Interest paid	69,686,000	59,234,000	53,875,000
Income taxes paid	714,000	854,000	657,000
Supplemental disclosure of non-cash investing and financing activities:
Acquisition of business in CCP Merger (see Note 3)	3,726,092,000	0	0
Assumption of indebtedness in CCP Merger	(1,751,373,000)	0	0
Stock exchanged in CCP Merger	(2,052,578,000)	0	0
Real estate acquired through loan receivable foreclosure	19,096,000	10,100,000	0
Proceeds from sale of real estate held by exchange accommodation titleholder variable interest entities	57,512,000	0	0
Decrease in loans receivable and other investments due to acquisition of real estate	(6,913,000)	0	0
Assumption of secured indebtedness	0	0	30,456,000
Increase in real estate investments due to variable interest consolidation	0	0	10,700,000
Decrease in loans receivable and preferred equity due to variable interest consolidation	$ 0	$ 0	$ (8,615,000)