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CONDENSED CONSOLIDATED STATEMENTS OF CHANGES IN SHAREHOLDERS' EQUITY (Unaudited) - USD ($) $ in Thousands	Total	Preference shares	Common shares	Additional paid-in capital	Accumulated other comprehensive loss	(Accumulated deficit) retained earnings	Treasury shares	Noncontrolling interests in subsidiaries
Beginning balance at Dec. 31, 2017		$ 465,000	$ 877	$ 748,113	$ 13,354	$ 35,472	$ (30,642)	$ 452
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Share-based compensation expense				1,208
Exercise of options and issuance of shares			2	(2)
Change in net unrealized gains (losses) on investment					(117,996)
Foreign currency translation adjustment					7,683			(18)
Net (loss) income attributable to Maiden	$ 24,905					24,905
Dividends on preference shares						(17,091)
Dividends on common shares						(24,948)
Shares repurchased							(193)
Disposal of subsidiaries								0
Net income attributable to noncontrolling interests								118
Ending balance at Jun. 30, 2018	1,106,294	465,000	879	749,319	(96,959)	18,338	(30,835)	552
Beginning balance at Mar. 31, 2018		465,000	879	749,054	(62,915)	36,727	(30,835)	534
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Share-based compensation expense				265
Exercise of options and issuance of shares			0
Change in net unrealized gains (losses) on investment					(49,678)
Foreign currency translation adjustment					15,634			(29)
Net (loss) income attributable to Maiden	2,633					2,633
Dividends on preference shares						(8,546)
Dividends on common shares						(12,476)
Shares repurchased							0
Disposal of subsidiaries								0
Net income attributable to noncontrolling interests								47
Ending balance at Jun. 30, 2018	1,106,294	465,000	879	749,319	(96,959)	18,338	(30,835)	552
Beginning balance at Dec. 31, 2018	554,916	465,000	879	749,418	(65,616)	(563,891)	(31,515)	641
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Share-based compensation expense				1,591
Exercise of options and issuance of shares			2	(2)
Change in net unrealized gains (losses) on investment					89,040
Foreign currency translation adjustment					(2,272)			78
Net (loss) income attributable to Maiden	(52,049)					(52,049)
Dividends on preference shares						0
Shares repurchased							(13)
Disposal of subsidiaries								(719)
Net income attributable to noncontrolling interests								0
Ending balance at Jun. 30, 2019	590,572	465,000	881	751,007	21,152	(615,940)	(31,528)	0
Beginning balance at Mar. 31, 2019		465,000	881	750,670	(220)	(600,527)	(31,515)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Share-based compensation expense				337
Change in net unrealized gains (losses) on investment					27,564
Foreign currency translation adjustment					(6,192)
Net (loss) income attributable to Maiden	(15,413)					(15,413)
Dividends on preference shares						0
Shares repurchased							(13)
Disposal of subsidiaries								0
Net income attributable to noncontrolling interests								0
Ending balance at Jun. 30, 2019	$ 590,572	$ 465,000	$ 881	$ 751,007	$ 21,152	$ (615,940)	$ (31,528)	$ 0