Condensed Consolidated Statements of Shareholder's Equity (Unaudited) - USD ($) $ in Thousands		Total	Preferred Stock	Common Stock	Surplus	Accumulated Deficit	Accumulated Other Comprehensive Income (Loss)	Non-Controlling Interests
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Cumulative effect adjustment related to ASU adoptions	[1]						$ (35,436)
Cumulative effect adjustment related to ASU adoptions | ASU 2016-02, 2017-12, 2018-02	[2]	$ 3,460				$ 38,896	(35,436)
Balance, as adjusted		13,515,989	$ 229,475	$ 2,230	$ 14,545,849	(1,068,302)	(222,284)	$ 29,021
Balance, beginning of period at Dec. 31, 2018		13,512,529	229,475	2,230	14,545,849	(1,107,198)	(186,848)	29,021
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net (loss) income		301,167				300,012		1,155
Other comprehensive income (loss), net of tax		235,792					235,792
Issuance of common stock		802			802
Preferred stock dividends		(10,247)			(9,210)			(1,037)
Common stock dividends		(170,000)			(170,000)
Capital contribution		134						134
Vesting of restricted stock		(2,914)			(2,914)
Balance, end of period at Jun. 30, 2019		13,870,723	229,475	2,230	14,364,527	(768,290)	13,508	29,273
Balance, beginning of period at Mar. 31, 2019		13,727,537	229,475	2,230	14,542,166	(927,877)	(148,135)	29,678
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net (loss) income		160,186				159,587		599
Other comprehensive income (loss), net of tax		161,643					161,643
Preferred stock dividends		(5,762)			(4,725)			(1,037)
Common stock dividends		(170,000)			(170,000)
Capital contribution		33						33
Vesting of restricted stock		(2,914)			(2,914)
Balance, end of period at Jun. 30, 2019		13,870,723	229,475	2,230	14,364,527	(768,290)	13,508	29,273
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Cumulative effect adjustment related to ASU adoptions | ASU 2016-13		(150,213)				(150,213)
Balance, as adjusted		13,236,376	229,475	2,230	14,043,727	(1,067,440)	(1,072)	29,456
Balance, beginning of period at Dec. 31, 2019		13,386,589	229,475	2,230	14,043,727	(917,227)	(1,072)	29,456
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net (loss) income		(2,361,722)				(2,362,695)		973
Other comprehensive income (loss), net of tax		405,237					405,237
Preferred stock dividends		(9,157)			(8,120)			(1,037)
Capital contribution		55						55
Balance, end of period at Jun. 30, 2020		11,270,789	229,475	2,230	14,035,607	(3,430,135)	404,165	29,447
Balance, beginning of period at Mar. 31, 2020		11,358,354	229,475	2,230	14,039,572	(3,305,226)	362,339	29,964
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net (loss) income		(124,437)				(124,909)		472
Other comprehensive income (loss), net of tax		41,826					41,826
Preferred stock dividends		(5,002)			(3,965)			(1,037)
Capital contribution		48						48
Balance, end of period at Jun. 30, 2020		$ 11,270,789	$ 229,475	$ 2,230	$ 14,035,607	$ (3,430,135)	$ 404,165	$ 29,447

[1] Related to the Company's adoption of ASU 2017-12 and ASU 2018-02 on January 1, 2019.

[2] Related to the Company's adoption of ASU 2016-02, ASU 2017-12 and ASU 2018-02 on January 1, 2019.