Condensed Consolidated Statements of Cash Flows - USD ($)		9 Months Ended
		Sep. 30, 2018	Sep. 30, 2017
Cash Flows from Operating Activities:
Consolidated net loss		$ (114,741,000)	$ (61,947,000)
Adjustments to reconcile consolidated net loss to net cash used for operating activities:
Net fair value adjustments	[1]	74,823,000	11,868,000
Change in fair value of loan servicing liabilities		(677,000)	(1,947,000)
Change in fair value of loan servicing assets		22,253,000	16,083,000
Stock-based compensation, net		57,369,000	54,692,000
Goodwill impairment charge		35,633,000	0
Depreciation and amortization		39,927,000	32,405,000
(Gain) Loss on sales of loans		(39,493,000)	(25,306,000)
Other, net		3,794,000	1,588,000
Purchase of loans held for sale		(5,431,011,000)	(4,240,099,000)
Principal payments received on loans held for sale		160,623,000	24,860,000
Proceeds from sales of whole loans		3,748,498,000	3,955,878,000
Purchase of loans held for sale by consolidated VIE		(270,770,000)	(491,414,000)
Proceeds from sale of securities by consolidated VIE, net of underwriting fees and costs		1,505,887,000	569,443,000
Net change in operating assets and liabilities:
Accrued interest receivable, net		(2,010,000)	4,174,000
Other assets		62,739,000	(13,663,000)
Accounts payable		(883,000)	(3,810,000)
Accrued interest payable		(10,563,000)	(5,596,000)
Accrued expenses and other liabilities		(103,561,000)	11,963,000
Net cash used for operating activities		(262,163,000)	(160,828,000)
Cash Flows from Investing Activities:
Purchases of loans		(778,931,000)	(1,407,664,000)
Principal payments received on loans		1,379,712,000	1,863,338,000
Proceeds from recoveries and sales of charged-off loans		49,463,000	34,808,000
Proceeds from sales of whole loans		0	2,118,000
Purchases of securities available for sale		(104,063,000)	(90,174,000)
Proceeds from sales, maturities, redemptions and paydowns of securities available for sale		118,965,000	191,504,000
Proceeds from paydowns of asset-backed securities related to Company-sponsored securitizations and CLUB Certificate transactions		31,557,000	2,268,000
Other investing activities		1,511,000	0
Purchases of property, equipment and software, net		(37,881,000)	(31,751,000)
Net cash provided by investing activities		660,333,000	564,447,000
Cash Flows from Financing Activities:
Change in payable to investors		(52,959,000)	(31,991,000)
Proceeds from issuance of notes and certificates		775,441,000	1,389,999,000
Repayments of secured borrowings		(116,065,000)	0
Principal payments on and retirements of notes and certificates		(1,261,918,000)	(1,863,041,000)
Payments on notes and certificates from recoveries/sales of related charged-off loans		(48,858,000)	(34,550,000)
Principal payments on securitization notes		(45,709,000)	0
Proceeds from credit facilities and securities sold under repurchase agreements		1,493,305,000	0
Principal payments on credit facilities and securities sold under repurchase agreements		(1,219,529,000)	0
Payment for debt issuance costs		(1,600,000)	0
Proceeds from issuances under equity incentive plans, net of tax		1,921,000	14,265,000
Proceeds from issuance of common stock for ESPP		2,773,000	2,856,000
Net cash outflow from deconsolidation of VIE		(15,013,000)	0
Purchase of noncontrolling interests in consolidated VIE		0	(6,307,000)
Return of capital to noncontrolling interests in consolidated VIE		(2,712,000)	(999,000)
Dividends paid to noncontrolling interests in consolidated VIE		(260,000)	(38,000)
Net cash used for financing activities		(491,183,000)	(529,806,000)
Net Decrease in Cash, Cash Equivalents and Restricted Cash		(93,013,000)	(126,187,000)
Cash, Cash Equivalents and Restricted Cash, Beginning of Period		644,289,000	693,412,000
Cash, Cash Equivalents and Restricted Cash, End of Period		551,276,000	567,225,000
Supplemental Cash Flow Information:
Cash paid for interest		309,641,000	454,026,000
Non-cash investing activity:
Accruals for property, equipment and software		1,657,000	1,360,000
Beneficial interests retained from securitization and CLUB Certificate transactions		82,939,000	36,065,000
Non-cash financing activity:
Noncontrolling interests’ contribution of beneficial interests in consolidated VIE		0	7,722,000
Derecognition of payable to securitization note and residual certificate holders held in consolidated VIE		$ 269,151,000	$ 0

[1] Prior period amounts have been reclassified to conform to the current period presentation. See “Notes to Condensed Consolidated Financial Statements – Note 1. Basis of Presentation” for additional information.