CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018
Cash flow from operating activities
Net income	$ 240,304	$ 191,483
Adjustments to reconcile net income to net cash used in operating activities:
Net gains on loans held for sale at fair value	(468,041)	(189,274)
Change in fair value of mortgage servicing rights, mortgage servicing liabilities and excess servicing spread	436,721	156,696
Capitalization of interest on loans held for sale at fair value	(56,800)	(67,025)
Accrual of interest on excess servicing spread financing	8,124	11,584
Amortization of net debt issuance (premiums) and costs	(6,601)	(19,198)
Results of real estate acquired in settlement of loans	(1,205)	(179)
Stock based compensation expense	19,124	20,766
Provision for servicing advance losses	19,973	24,046
Depreciation and amortization	10,650	9,046
Amortization of right-to-use assets	7,258
Purchase of loans held for sale from nonaffiliates	(1,132,749)	(409,546)
Origination of loans held for sale	(7,249,762)	(3,640,045)
Purchase of loans from Ginnie Mae securities and early buyout investors for modification and subsequent sale	(4,172,281)	(3,342,029)
Sale and principal payments of loans held for sale to non-affiliates	39,084,441	34,208,217
Repurchase of loans subject to representations and warranties	(15,427)	(24,891)
Settlement of repurchase agreement derivatives	31,993	19,460
(Increase) decrease in servicing advances	(9,871)	35,813
Sale of real estate acquired in settlement of loans	17,141	3,004
(Increase) decrease in other assets	(22,415)	9,291
Decrease in operating lease liabilities	(9,234)
Increase in accounts payable and accrued expenses	78,800	14,021
Net cash (used in) provided by operating activities	(1,690,141)	732,584
Cash flow from investing activities
Decrease in short-term investments	27,161	24,604
Net settlement of derivative financial instruments used for hedging	542,139	(182,402)
Purchase of mortgage servicing rights	(227,445)	(180,139)
Purchase of furniture, fixtures, equipment and leasehold improvements	(5,534)	(8,919)
Acquisition of capitalized software	(22,190)	(13,091)
Increase in margin deposits	(168,062)	(836)
Net cash provided by (used in) investing activities	169,416	(349,783)
Cash flow from financing activities
Sale of assets under agreements to repurchase	41,296,345	31,318,277
Repurchase of assets sold under agreements to repurchase	(39,692,086)	(31,960,304)
Issuance of mortgage loan participation purchase and sale certificates	17,498,589	19,398,281
Repayment of mortgage loan participation purchase and sale certificates	(17,516,431)	(19,401,301)
Advances of obligations under capital lease	25,123
Repayments of obligations under capital lease	(7,847)	(11,341)
Advances on notes payable		1,300,000
Repayments of notes payable		(900,000)
Repayment of excess servicing spread financing	(30,901)	(35,852)
Payment of debt issuance costs	(4,489)	(15,320)
Issuance of common stock pursuant to exercise of stock options	3,900	4,718
Repurchase of common stock	(1,056)	(4,826)
Payment of withholding taxes relating to stock-based compensation	(4,634)
Payment of dividend to Class A common stockholders		(10,054)
Net cash provided by (used in) financing activities	1,566,513	(317,722)
Net increase in cash and restricted cash	45,788	65,079
Cash and restricted cash at beginning of period	155,924	38,173
Cash and restricted cash at end of period	201,712	103,252
Cash	201,268	102,627
Restricted cash included in Other assets	444	625
Investment Funds
Adjustments to reconcile net income to net cash used in operating activities:
Carried Interest from Investment Funds		365
PMT
Adjustments to reconcile net income to net cash used in operating activities:
Change in fair value of investment in common shares of PennyMac Mortgage Investment Trust	(270)	(313)
Purchase of loans held for sale from PennyMac Mortgage Investment Trust	(32,619,639)	(28,584,762)
Sale of loans held for sale to Penny Mac Mortgage Investment Trust	4,095,079	2,336,162
Increase in receivable from affiliates	(9,598)	(2,825)
Decrease in payable to affiliate	(45,869)	(46,731)
Increase in income taxes payable	80,013	19,448
Cash flow from investing activities
Net change in assets purchased from PMT under agreement to resell	$ 23,347	$ 11,000