Consolidated Statements of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017
Cash flows from operating activities
Net income	$ 133,624	$ 102,018
Adjustments to reconcile net income to net cash provided by operating activities
Non-cash compensation expense	13,754	11,866
Amortization of deferred fees on loans	(24,161)	(16,796)
Amortization of deferred financing costs and premiums/discount on debt obligations	13,631	9,488
Changes in assets and liabilities, net
Other assets	(16,582)	(1,255)
Other liabilities	14,745	5,492
Net cash provided by operating activities	135,011	110,813
Cash flows from investing activities
Origination and fundings of loans receivable	(4,200,035)	(1,464,994)
Principal collections and sales proceeds from loans receivable	1,966,125	1,097,022
Origination and exit fees received on loans receivable	62,200	25,228
Receipts under derivative financial instruments	20,784	6,115
Payments under derivative financial instruments	(7,452)	(9,398)
Return of collateral deposited under derivative agreements	21,870
Collateral deposited under derivative agreements	(17,750)
Net cash used in investing activities	(2,154,258)	(346,027)
Cash flows from financing activities
Borrowings under secured debt agreements	4,602,835	1,744,766
Repayments under secured debt agreements	(2,824,358)	(1,673,886)
Proceeds from sale of loan participations	72,384
Payment of deferred financing costs	(15,815)	(9,800)
Contributions from non-controlling interests	2,475
Distributions to non-controlling interests	(3,986)
Net proceeds from issuance of convertible notes	214,775	280,473
Repayment of convertible notes	(192)
Net proceeds from issuance of class A common stock	102,496	16
Dividends paid on class A common stock	(133,968)	(117,402)
Net cash provided by financing activities	2,016,646	224,167
Net decrease in cash, cash equivalents, and restricted cash	(2,601)	(11,047)
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	7,140	3,279
Cash, cash equivalents, and restricted cash at end of period	107,057	67,799
Supplemental disclosure of cash flows information
Payments of interest	(138,451)	(88,519)
Payments of income taxes	(263)	(141)
Supplemental disclosure of non-cash investing and financing activities
Dividends declared, not paid	(69,094)	(58,793)
Loan principal payments held by servicer, net	$ 1,330	5,082
Consolidation of loans receivable of a VIE		500,000
Consolidation of securitized debt obligations of a VIE		$ (474,620)