Consolidated Statements of Cash Flows - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017
Cash flows from operating activities
Net income	$ 211,917	$ 159,829
Adjustments to reconcile net income to net cash provided by operating activities
Non-cash compensation expense	20,488	17,809
Amortization of deferred fees on loans and debt securities	(35,955)	(28,887)
Amortization of deferred financing costs and premiums/ discount on debt obligations	20,993	16,356
Changes in assets and liabilities, net
Other assets	(9,709)	(219)
Other liabilities	15,001	11,651
Net cash provided by operating activities	222,735	176,539
Cash flows from investing activities
Origination and fundings of loans receivable	(5,222,803)	(2,314,721)
Principal collections and sales proceeds from loans receivable	2,503,454	1,976,271
Loan contributed to securitization	512,002
Investment in debt securities held-to-maturity	(95,937)
Origination and exit fees received on loans receivable	74,111	38,434
Receipts under derivative financial instruments	34,975	6,115
Payments under derivative financial instruments	(14,031)	(18,115)
Return of collateral deposited under derivative agreements	28,870	8,980
Collateral deposited under derivative agreements	(32,110)	(16,651)
Net cash used in investing activities	(2,211,469)	(319,687)
Cash flows from financing activities
Borrowings under secured debt agreements	5,749,678	2,776,058
Repayments under secured debt agreements	(4,147,893)	(2,481,250)
Proceeds from sale of loan participations	86,339	33,193
Repayment of loan participations	(85,875)	(381,310)
Payment of deferred financing costs	(18,995)	(13,591)
Contributions from non-controlling interests	4,500	6,090
Distributions to non-controlling interests	(4,100)
Net proceeds from issuance of convertible notes	214,775	394,074
Repayment of convertible notes	(192)
Net proceeds from issuance of class A common stock	369,787	31
Dividends paid on class A common stock	(203,065)	(176,195)
Net cash provided by financing activities	1,964,959	157,100
Net decrease in cash, cash equivalents, and restricted cash	(23,775)	13,952
Cash, cash equivalents, and restricted cash at beginning of period	102,518	75,567
Effects of currency translation on cash, cash equivalents, and restricted cash	8,244	4,566
Cash, cash equivalents, and restricted cash at end of period	86,987	94,085
Supplemental disclosure of cash flows information
Payments of interest	(224,320)	(141,124)
Payments of income taxes	(546)	(220)
Supplemental disclosure of non-cash investing and financing activities
Dividends declared, not paid	(74,195)	(58,793)
Loan principal payments held by servicer, net	$ 3,577	513
Consolidation of loans receivable of a VIE		500,000
Consolidation of securitized debt obligations of a VIE		$ (474,620)