Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Cash flows from operating activities
Net income	$ 61,116	$ 51,405
Adjustments to reconcile net income to net cash provided by operating activities
Non-cash compensation expense	6,976	5,907
Amortization of deferred fees on loans	(11,229)	(8,808)
Amortization of deferred financing costs and premiums/discount on debt obligations	6,331	4,535
Changes in assets and liabilities, net
Other assets	(354)	1,699
Other liabilities	9,739	2,636
Net cash provided by operating activities	72,579	57,374
Cash flows from investing activities
Origination and fundings of loans receivable	(1,978,213)	(702,353)
Principal collections and sales proceeds from loans receivable	1,001,682	567,321
Origination and exit fees received on loans receivable	18,881	12,429
Payments under derivative financial instruments	(7,397)	(3,752)
Receipts under derivative financial instruments	22	1,903
Collateral deposited under derivative agreements	(13,210)
Return of collateral deposited under derivative agreements	10,740
Net cash used in investing activities	(967,495)	(124,452)
Cash flows from financing activities
Borrowings under secured debt agreements	1,949,135	789,865
Repayments under secured debt agreements	(1,265,100)	(672,161)
Proceeds from sale of loan participations	37,483
Payment of deferred financing costs	(10,217)	(3,895)
Contributions from non-controlling interests	375
Distributions to non-controlling interests	(1,575)
Net proceeds from issuance of convertible notes	214,463
Net proceeds from issuance of class A common stock		8
Dividends paid on class A common stock	(66,888)	(58,615)
Net cash provided by financing activities	857,676	55,202
Net decrease in cash, cash equivalents, and restricted cash	(37,240)	(11,876)
Cash, cash equivalents, and restricted cash at beginning of year	102,518	75,567
Effects of currency translation on cash, cash equivalents, and restricted cash	9,200	584
Cash, cash equivalents, and restricted cash at end of year	74,478	64,275
Supplemental disclosure of cash flows information
Payments of interest	(55,582)	(39,287)
Payments of income taxes	(135)	(50)
Supplemental disclosure of non-cash investing and financing
Dividends declared, not paid	(67,080)	(58,787)
Loan principal payments held by servicer, net	$ 4,684	$ 42,715