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Shareholders' Equity (Details) (USD $)
In Thousands, except Share data, unless otherwise specified |
3 Months Ended | 6 Months Ended | 3 Months Ended | 6 Months Ended | 3 Months Ended | 6 Months Ended | 0 Months Ended | 3 Months Ended | 6 Months Ended | |||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
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Jun. 30, 2013
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Jun. 30, 2012
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Jun. 30, 2013
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Jun. 30, 2012
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Dec. 31, 2012
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Jun. 30, 2013
Change in net unrealized gains on investments [Member]
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Jun. 30, 2012
Change in net unrealized gains on investments [Member]
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Jun. 30, 2013
Change in net unrealized gains on investments [Member]
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Jun. 30, 2012
Change in net unrealized gains on investments [Member]
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Jun. 30, 2013
Foreign currency translation adjustments [Member]
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Jun. 30, 2012
Foreign currency translation adjustments [Member]
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Jun. 30, 2013
Foreign currency translation adjustments [Member]
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Jun. 30, 2012
Foreign currency translation adjustments [Member]
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Aug. 22, 2012
Preference Shares - Series A [Member]
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Jun. 30, 2013
Preference Shares - Series A [Member]
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Jun. 30, 2013
Preference Shares - Series A [Member]
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| Class of Stock [Line Items] | ||||||||||||||||
| Number of Preference Shares issued (in shares) | 6,000,000 | |||||||||||||||
| Dividend rate of Preference Shares | 8.25% | |||||||||||||||
| Par value of Preference Shares (in dollars per share) | $ 0.01 | |||||||||||||||
| Share price (in dollars per share) | $ 25.000 | |||||||||||||||
| Proceeds from issuance of Preference Shares | $ 145,041 | |||||||||||||||
| Expenses and underwriting discounts | 4,959 | |||||||||||||||
| Redemption price for Preference Shares (in dollars per share) | $ 25.000 | |||||||||||||||
| Sale price of Preference Shares (in dollars per share) | $ 25.00 | |||||||||||||||
| Dividends, Preferred Stock | 3,094 | 0 | 6,188 | 0 | 3,094 | 6,188 | ||||||||||
| Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] | ||||||||||||||||
| Beginning balance | 133,083 | 90,849 | 141,126 | 64,051 | 132,736 | 93,036 | 143,665 | 63,737 | 347 | (2,187) | (2,539) | 314 | ||||
| Other comprehensive income before reclassifications | (85,058) | 4,712 | (90,020) | 31,520 | (83,489) | 803 | (91,337) | 30,112 | (1,569) | 3,909 | 1,317 | 1,408 | ||||
| Amounts reclassified from accumulated other comprehensive income | 0 | (9) | (3,081) | (19) | 0 | (9) | (3,081) | (19) | 0 | 0 | 0 | 0 | ||||
| Other comprehensive (loss) income | (85,058) | 4,703 | (93,101) | 31,501 | (83,489) | 794 | (94,418) | 30,093 | (1,569) | 3,909 | 1,317 | 1,408 | ||||
| Ending balance | 48,025 | 95,552 | 48,025 | 95,552 | 49,247 | 93,830 | 49,247 | 93,830 | (1,222) | 1,722 | (1,222) | 1,722 | ||||
| Noncontrolling interest | (10) | (6) | (10) | (6) | 0 | 0 | 0 | 0 | (10) | (6) | (10) | (6) | ||||
| Ending balance, Maiden shareholders | $ 48,035 | $ 95,558 | $ 48,035 | $ 95,558 | $ 141,130 | $ 49,247 | $ 93,830 | $ 49,247 | $ 93,830 | $ (1,212) | $ 1,728 | $ (1,212) | $ 1,728 | |||