CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY - USD ($) shares in Thousands, $ in Thousands	Common Stock. Common Stock	Common Stock.	Additional paid-in capital	Retained earnings	Noncontrolling interest in Private National Mortgage Acceptance Company, LLC	Common Stock	Total
Balance at Dec. 31, 2018	$ 8		$ 1,310,648	$ 343,135	$ 1,653,791
Balance (in shares) at Dec. 31, 2018	77,494
Changes in stockholders' equity
Net income				46,135	46,135		$ 46,135
Stock based compensation			1,180		1,180
Stock based compensation (in shares)	820
Issuance of common stock in settlement of director fees			86		86		86
Issuance of common stock in settlement of director fees (in shares)	4
Balance at Mar. 31, 2019	$ 8		1,311,914	389,270	$ 1,701,192
Balance (in shares) at Mar. 31, 2019	78,318
Balance at Dec. 31, 2019		$ 8	1,335,107	726,392			2,061,507
Balance (in shares) at Dec. 31, 2019		78,515
Changes in stockholders' equity
Net income				306,243			306,243
Stock based compensation			10,185				10,185
Stock based compensation (in shares)		912
Common stock dividends				(9,733)			(9,733)
Issuance of common stock in settlement of director fees			48				48
Issuance of common stock in settlement of director fees (in shares)		1
Repurchase of common stock			(4,121)			$ (4,121)	(4,121)
Repurchase of common stock (in shares)		(238)				(238)
Balance at Mar. 31, 2020		$ 8	$ 1,341,219	$ 1,022,902			$ 2,364,129
Balance (in shares) at Mar. 31, 2020		79,190