v3.19.2
Shareholders' Equity - AOCI Components (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]        
Beginning balance     $ 554,916  
Other comprehensive income (loss), after tax $ 21,372 $ (34,073) 86,846 $ (110,331)
Ending balance 590,572 1,106,294 590,572 1,106,294
Change in net unrealized gains on investments, including portion attributable to noncontrolling interest        
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]        
Beginning balance 1,714 (46,429) (59,762) 21,889
Other comprehensive income (loss) before reclassifications 42,979 (50,423) 91,967 (117,251)
Amounts reclassified from AOCI to net income, net of tax (15,415) 745 (2,927) (745)
Other comprehensive income (loss), after tax 27,564 (49,678) 89,040 (117,996)
Ending balance   (96,107)   (96,107)
Foreign currency translation adjustments, including portion attributable to noncontrolling interest        
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]        
Beginning balance (1,934) (16,523) (5,932) (8,583)
Other comprehensive income (loss) before reclassifications (6,192) 15,605 (2,194) 7,665
Amounts reclassified from AOCI to net income, net of tax 0 0 0 0
Other comprehensive income (loss), after tax (6,192) 15,605 (2,194) 7,665
Ending balance   (918)   (918)
AOCI including portion attributable to noncontrolling interest        
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]        
Beginning balance (220) (62,952) (65,694) 13,306
Other comprehensive income (loss) before reclassifications 36,787 (34,818) 89,773 (109,586)
Amounts reclassified from AOCI to net income, net of tax (15,415) 745 (2,927) (745)
Other comprehensive income (loss), after tax 21,372 (34,073) 86,846 (110,331)
Ending balance   (97,025)   (97,025)
Change in net unrealized gains on investment attributable to noncontrolling interest        
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]        
Ending balance   0   0
Foreign currency translation adjustments attributable to noncontrolling interest        
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]        
Ending balance   (66)   (66)
AOCI attributable to noncontrolling interest        
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]        
Ending balance   (66)   (66)
Change in net unrealized gains on investments, attributable to Maiden shareholders        
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]        
Ending balance 29,278 (96,107) 29,278 (96,107)
Foreign currency translation adjustments, attributable to Maiden shareholders        
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]        
Ending balance (8,126) (852) (8,126) (852)
AOCI attributable to Maiden shareholders        
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]        
Beginning balance (220) (62,915) (65,616) 13,354
Ending balance $ 21,152 $ (96,959) $ 21,152 $ (96,959)