Commitments and Contingencies (Narrative) (Details) $ in Millions	Sep. 30, 2016 USD ($)
Commitments and Contingencies [Abstract]
Contingent liability premium taxes	$ 2.5
Contingent liability penalties and interest	$ 0.7

The amount represents the penalties and interest on the amount of premium taxes that the Texas Comptroller's office asserts is owed by the Company.

No definition available.

Name:	hall_ContingentLiabilityPenaltiesAndInterest
Namespace Prefix:	hall_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant