Supplemental Cash Flow Information (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Cash paid for interest	$ 112,730	$ 64,527
(Refunds received) cash paid for income taxes, net	(15)	13
Non-cash investing activity:
Mortgage servicing rights resulting from loan sales	470,533	282,315
Unsettled portion of MSR acquisitions		1,656
Operating right-of-use assets recognized	3,243	1,534
Mortgage servicing liabilities resulting from loan sales	6,962	6,576
Non-cash financing activity:
Issuance of Excess servicing spread payable to PennyMac Mortgage Investment Trust pursuant to a recapture agreement	557	379
Issuance of common stock in settlement of director fees	$ 51	$ 48