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Deferred Policy Acquisition Costs (Deferred Amortized Policy Acquisition Costs) (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Document and Entity Information [Abstract]    
Deferred $ (3,718)hall_DeferredAmortizedPolicyAcquisitionCostsDeferred $ (15,455)hall_DeferredAmortizedPolicyAcquisitionCostsDeferred
Amortized 3,334us-gaap_DeferredPolicyAcquisitionCostAmortizationExpense 15,189us-gaap_DeferredPolicyAcquisitionCostAmortizationExpense
Net $ (384)us-gaap_DeferredPolicyAcquisitionCostsPeriodIncreaseDecrease $ (266)us-gaap_DeferredPolicyAcquisitionCostsPeriodIncreaseDecrease