Consolidated Statements of Cash Flows - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016
Cash flows from operating activities
Net income	$ 159,829	$ 193,040
Adjustments to reconcile net income to net cash provided by operating activities
Non-cash compensation expense	17,809	16,517
Amortization of deferred fees on loans	(28,887)	(31,594)
Amortization of deferred financing costs and premiums/discount on debt obligations	16,356	15,129
Income from equity investment in unconsolidated subsidiary		(2,192)
Distributions of income from unconsolidated subsidiary		8,167
Gain on investments at fair value		(13,413)
Changes in assets and liabilities, net
Other assets	(219)	8,315
Other liabilities	11,651	(6,405)
Net cash provided by operating activities	176,539	187,564
Cash flows from investing activities
Origination and fundings of loans receivable	(2,314,721)	(2,300,636)
Principal collections and sales proceeds from loans receivable and other assets	1,976,271	3,054,821
Origination and exit fees received on loans receivable	38,434	35,388
Receipts under derivative financial instruments	6,115
Payments under derivative financial instruments	(18,115)
Return of collateral deposited under derivative agreements	8,980
Collateral deposited under derivative agreements	(16,651)
Net cash (used in) provided by investing activities	(319,687)	789,573
Cash flows from financing activities
Borrowings under secured debt agreements	2,776,058	2,225,895
Repayments under secured debt agreements	(2,481,250)	(2,988,217)
Proceeds from sale of loan participations	33,193	54,441
Repayment of loan participations	(381,310)	(92,000)
Payment of deferred financing costs	(13,591)	(12,564)
Receipts under derivative financial instruments		31,668
Payments under derivative financial instruments		(14,266)
Contributions from non-controlling interests	6,090
Distributions to non-controlling interests		(20,158)
Net proceeds from issuance of convertible notes	394,074
Net proceeds from issuance of class A common stock	31	20
Dividends paid on class A common stock	(176,195)	(174,549)
Net cash provided by (used in) financing activities	157,100	(989,730)
Net increase (decrease) in cash, cash equivalents, and restricted cash	13,952	(12,593)
Cash, cash equivalents, and restricted cash at beginning of period	75,567	106,005
Effects of currency translation on cash, cash equivalents, and restricted cash	4,566	1,526
Cash, cash equivalents, and restricted cash at end of period	94,085	94,938
Supplemental disclosure of cash flows information
Payments of interest	(141,124)	(123,564)
Payments of income taxes	(220)	(131)
Supplemental disclosure of non-cash investing and financing activities
Dividends declared, not paid	(58,793)	(58,388)
Loan principal payments held by servicer, net	513	$ 9,515
Consolidation of loans receivable of a VIE	500,000
Consolidation of securitized debt obligations of a VIE	$ (474,620)