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Aggregate dividends declared during the period for each share of common stock outstanding.

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For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

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Amount of assets pledged to secure a debt instrument.

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The amount of unfunded commitments for which the entity is obligated, to those certain investments for which net asset value per share is calculated (including by unit, membership interest, or other equity (ownership interest) unit measure) (alternative investments).

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Term of the lessee's leasing arrangement renewal, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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No definition available.

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The total amount of the contingent obligation under letters of credit outstanding as of the reporting date.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Amount of required minimum rental payments for leases having an initial or remaining non-cancelable letter-terms in excess of one year.

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Amount of required minimum rental payments for operating leases having an initial or remaining non-cancelable lease term in excess of one year due in the next fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount of required minimum rental payments for operating leases having an initial or remaining non-cancelable lease term in excess of one year due in the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount of required minimum rental payments for operating leases having an initial or remaining non-cancelable lease term in excess of one year due in the fourth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount of required minimum rental payments for operating leases having an initial or remaining non-cancelable lease term in excess of one year due in the third fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount of required minimum rental payments for operating leases having an initial or remaining non-cancelable lease term in excess of one year due in the second fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Rental expense for the reporting period incurred under operating leases, including minimum and any contingent rent expense, net of related sublease income.

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Amount of direct and assumed premiums written.

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Commitments, Contingencies and Concentrations (Details) $ / shares in Units, $ in Thousands		12 Months Ended
	Nov. 04, 2015 $ / shares	Dec. 31, 2015 USD ($) broker $ / shares	Dec. 31, 2014 USD ($) $ / shares	Dec. 31, 2013 USD ($) $ / shares
Loss Contingencies [Line Items]
Gross premiums written		$ 2,662,825	$ 2,507,352	$ 2,204,159
Letters of credit outstanding		$ 76,964	82,489
Renewal term (in years)		5 years
Rent expense		$ 1,984	$ 2,220	$ 2,171
2016		1,395
2017		1,126
2018		534
2019		491
2020		345
Total		$ 3,891
Dividends declared per common share (in dollars per share) \| $ / shares	$ 0.14	$ 0.53	$ 0.46	$ 0.38
Letter of credit
Loss Contingencies [Line Items]
Collateral		$ 108,666	$ 115,151
AmTrust Reinsurance
Loss Contingencies [Line Items]
Gross premiums written		1,885,974	1,610,485	$ 1,169,961
Diversified Reinsurance
Loss Contingencies [Line Items]
Gross premiums written		$ 776,852	$ 897,748	$ 848,790
Segment concentration risk \| Gross premiums written \| AmTrust Reinsurance
Loss Contingencies [Line Items]
Concentration risk, percentage		70.80%	64.20%	53.10%
Broker concentration risk \| Gross premiums written \| Diversified Reinsurance
Loss Contingencies [Line Items]
Concentration risk, percentage		54.60%	57.10%	57.70%
Number of major brokers \| broker		3
Broker concentration risk \| Gross premiums written \| Diversified Reinsurance \| Top 3 Brokers
Loss Contingencies [Line Items]
Concentration risk, percentage		36.90%	31.60%	29.90%
Broker concentration risk \| Gross premiums written \| Diversified Reinsurance \| Aon Benfield Group, Ltd.
Loss Contingencies [Line Items]
Concentration risk, percentage		17.30%	15.80%	11.90%
Broker concentration risk \| Gross premiums written \| Diversified Reinsurance \| Marsh & McLennan Inc.
Loss Contingencies [Line Items]
Concentration risk, percentage		12.20%	12.00%	12.60%
Broker concentration risk \| Gross premiums written \| Diversified Reinsurance \| U.S. RE Corporation
Loss Contingencies [Line Items]
Concentration risk, percentage		7.40%
Broker concentration risk \| Gross premiums written \| Diversified Reinsurance \| Tiger Risk Partners
Loss Contingencies [Line Items]
Concentration risk, percentage			3.80%
Broker concentration risk \| Gross premiums written \| Diversified Reinsurance \| Beach & Associates, Ltd.
Loss Contingencies [Line Items]
Concentration risk, percentage				5.40%
Investments in limited partnerships
Loss Contingencies [Line Items]
Unfunded commitment on investments in limited partnerships		$ 622	$ 736