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Other Operating Expenses (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Other Operating Expenses [Abstract]      
Amortization of gross deferred policy acquisition costs $ 48,872us-gaap_DeferredPolicyAcquisitionCostAmortizationExpense $ 47,414us-gaap_DeferredPolicyAcquisitionCostAmortizationExpense $ 41,957us-gaap_DeferredPolicyAcquisitionCostAmortizationExpense
Other underwriting expenses 37,830us-gaap_OtherUnderwritingExpense 35,281us-gaap_OtherUnderwritingExpense 27,242us-gaap_OtherUnderwritingExpense
Expense allowances from reinsurers (23,797)us-gaap_ReinsuranceCostsAndRecoveriesNet (20,822)us-gaap_ReinsuranceCostsAndRecoveriesNet (15,185)us-gaap_ReinsuranceCostsAndRecoveriesNet
Total underwriting expenses 62,905bwinb_TotalUnderwritingExpenses 61,873bwinb_TotalUnderwritingExpenses 54,014bwinb_TotalUnderwritingExpenses
Operating expenses of non-insurance companies 25,143us-gaap_OperatingExpenses 23,488us-gaap_OperatingExpenses 23,416us-gaap_OperatingExpenses
Total other operating expenses $ 88,048us-gaap_OtherCostAndExpenseOperating $ 85,361us-gaap_OtherCostAndExpenseOperating $ 77,430us-gaap_OtherCostAndExpenseOperating