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Long-Term Debt (Details) (USD $)
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3 Months Ended | 6 Months Ended | 1 Months Ended | 3 Months Ended | 6 Months Ended | 12 Months Ended | 1 Months Ended | 3 Months Ended | 6 Months Ended | 0 Months Ended | 1 Months Ended | 3 Months Ended | 6 Months Ended | 12 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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Jan. 20, 2009
Maiden Capital Financing Trust [Member]
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Jun. 30, 2011
Senior notes [Member]
8.25% Senior note [Member]
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Jun. 30, 2013
Senior notes [Member]
8.25% Senior note [Member]
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Jun. 30, 2012
Senior notes [Member]
8.25% Senior note [Member]
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Jun. 30, 2013
Senior notes [Member]
8.25% Senior note [Member]
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Jun. 30, 2012
Senior notes [Member]
8.25% Senior note [Member]
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Dec. 31, 2011
Senior notes [Member]
8.25% Senior note [Member]
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Dec. 31, 2012
Senior notes [Member]
8.25% Senior note [Member]
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Mar. 31, 2012
Senior notes [Member]
8.00% Senior note [Member]
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Jun. 30, 2013
Senior notes [Member]
8.00% Senior note [Member]
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Jun. 30, 2012
Senior notes [Member]
8.00% Senior note [Member]
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Jun. 30, 2013
Senior notes [Member]
8.00% Senior note [Member]
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Jun. 30, 2012
Senior notes [Member]
8.00% Senior note [Member]
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Dec. 31, 2012
Senior notes [Member]
8.00% Senior note [Member]
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Jul. 15, 2011
Junior subordinated debt [Member]
Trust Preferred Securities [Member]
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Jan. 20, 2009
Junior subordinated debt [Member]
Trust Preferred Securities [Member]
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Jun. 30, 2011
Junior subordinated debt [Member]
Trust Preferred Securities [Member]
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Jun. 30, 2013
Junior subordinated debt [Member]
Trust Preferred Securities [Member]
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Jun. 30, 2012
Junior subordinated debt [Member]
Trust Preferred Securities [Member]
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Jun. 30, 2013
Junior subordinated debt [Member]
Trust Preferred Securities [Member]
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Dec. 31, 2011
Junior subordinated debt [Member]
Trust Preferred Securities [Member]
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Dec. 31, 2012
Junior subordinated debt [Member]
Trust Preferred Securities [Member]
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Jan. 20, 2009
Junior subordinated debt [Member]
Trust Preferred Securities [Member]
Founding Shareholders [Member]
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Jan. 20, 2009
Junior subordinated debt [Member]
Trust Preferred Securities [Member]
Institutional Shareholders [Member]
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Jun. 30, 2013
Junior subordinated debt [Member]
Trust Preferred Securities [Member]
Maiden Capital Financing Trust [Member]
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Jan. 20, 2009
Junior subordinated debt [Member]
Trust Preferred Securities [Member]
Maiden Capital Financing Trust [Member]
Unit
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| Debt Instrument [Line Items] | |||||||||||||||||||||||||||||||
| Face amount | $ 107,500,000 | $ 107,500,000 | $ 107,500,000 | $ 100,000,000 | $ 260,000,000 | ||||||||||||||||||||||||||
| Stated interest rate | 8.25% | 8.00% | 14.00% | 14.00% | |||||||||||||||||||||||||||
| Portion redeemable for cash at maturity | 100.00% | 100.00% | |||||||||||||||||||||||||||||
| Minimum redemption notice period | 30 days | ||||||||||||||||||||||||||||||
| Effective interest rate | 8.47% | 8.28% | 16.95% | 16.95% | |||||||||||||||||||||||||||
| Proceeds from issuance | 104,689,000 | 96,594,000 | |||||||||||||||||||||||||||||
| Debt issuance costs | 2,811,000 | 3,406,000 | 4,342,000 | ||||||||||||||||||||||||||||
| Amortization of financing costs | 23,000 | 23,000 | 46,000 | 46,000 | 28,000 | 28,000 | 56,000 | 29,000 | |||||||||||||||||||||||
| Interest expense | 9,570,000 | 9,568,000 | 19,140,000 | 17,246,000 | 2,217,000 | 2,217,000 | 4,434,000 | 4,434,000 | 2,000,000 | 2,000,000 | 4,000,000 | 2,111,000 | 5,338,000 | 5,338,000 | 10,675,000 | 10,675,000 | |||||||||||||||
| Accrued interest | 394,000 | 394,000 | 394,000 | 111,000 | 111,000 | 111,000 | 4,448,000 | 4,448,000 | 4,448,000 | ||||||||||||||||||||||
| Number of units issued (in units) | 260,000 | ||||||||||||||||||||||||||||||
| Principal amount per unit (in dollars per unit) | 1,000 | ||||||||||||||||||||||||||||||
| Number of common shares per unit (in shares per unit) | 45 | ||||||||||||||||||||||||||||||
| Common shares, par value | $ 0.01 | $ 0.01 | $ 0.01 | $ 0.01 | |||||||||||||||||||||||||||
| Purchase price per unit (in dollars per unit) | 1,000.45 | ||||||||||||||||||||||||||||||
| Number of common shares included in units issued (in shares) | 11,700,000 | ||||||||||||||||||||||||||||||
| Proceeds from issuance | 260,117,000 | ||||||||||||||||||||||||||||||
| Number of units purchased (in shares) | 159,000 | 101,000 | |||||||||||||||||||||||||||||
| Portion of units purchased by certain trusts | 61.12% | ||||||||||||||||||||||||||||||
| Period in which if the principal is paid in full, additional interest will be due | 5 years | ||||||||||||||||||||||||||||||
| Period used to calculate additional interest for early repurchase | 1 year | ||||||||||||||||||||||||||||||
| Principal amount repurchased | 107,500,000 | ||||||||||||||||||||||||||||||
| Additional repurchase expense | 21,350,000 | 21,350,000 | |||||||||||||||||||||||||||||
| Unamortized discount | 44,928,000 | 44,928,000 | |||||||||||||||||||||||||||||
| Market price (in dollars per share) | $ 3.85 | ||||||||||||||||||||||||||||||
| Discount amortization period from issuance | 30 years | ||||||||||||||||||||||||||||||
| Repurchase interest expense amount | 15,050,000 | ||||||||||||||||||||||||||||||
| Accelerated amortization of debt issuance costs and discount | 20,313,000 | ||||||||||||||||||||||||||||||
| Junior subordinated debt | 126,348,000 | 126,348,000 | 126,317,000 | 126,348,000 | 126,348,000 | ||||||||||||||||||||||||||
| Principal balance | 152,500,000 | 152,500,000 | |||||||||||||||||||||||||||||
| Unamortized discount | 26,152,000 | 26,152,000 | |||||||||||||||||||||||||||||
| Amortization expense | $ 16,000 | $ 13,000 | $ 31,000 | $ 26,000 | |||||||||||||||||||||||||||