Unaudited Consolidated Statements of Changes in Shareholders' Equity - USD ($) $ in Thousands	Total	Common shares	Additional paid-in capital	Accumulated other comprehensive income (loss)	Unrealized holding gains (losses) of available for sale investments	Currency translation adjustment	Common shares held in treasury, at cost	Retained earnings (deficit)
Cumulative effect of adoption of updated accounting guidance for credit losses at January 1, 2020								$ 0
Balance, beginning of period at Dec. 31, 2018		$ 227	$ 895,386	$ (4,730)	$ (4,158)	$ (572)	$ 0	(1,275)
Common shares issued		0	0
Share compensation expense			0
Unrealized holding gains (losses) of available for sale investments, net of reclassification adjustments	$ 4,816				4,816
Currency translation adjustment	(165)					(165)
Shares repurchased for treasury							0
Net income (loss) before preference dividends	52,539							52,539
Preferred share dividends paid and accrued	(4,907)							(4,907)
Balance, end of period at Mar. 31, 2019	941,891	227	895,386	(79)	658	(737)	0	46,357
Cumulative effect of adoption of updated accounting guidance for credit losses at January 1, 2020								(428)
Balance, beginning of period at Dec. 31, 2019	872,353	227	898,083	5,629	6,252	(623)	(75,056)	43,470
Common shares issued		0	250
Share compensation expense			360
Unrealized holding gains (losses) of available for sale investments, net of reclassification adjustments	(37,972)				(37,972)
Currency translation adjustment	137					137
Shares repurchased for treasury	(77,900)						(2,867)
Net income (loss) before preference dividends	(266,608)							(266,608)
Preferred share dividends paid and accrued	(1,171)							(1,171)
Balance, end of period at Mar. 31, 2020	$ 564,054	$ 227	$ 898,693	$ (32,206)	$ (31,720)	$ (486)	$ (77,923)	$ (224,737)