Commitments and Contingencies (Details Textual) (USD $) In Millions, unless otherwise specified	6 Months Ended
Jun. 30, 2012
Contingency Value In Premium Taxes	$ 4.5
Contingency Value In Penalties and Interest	$ 0.9

Contingency value in penalties and interest by the related businees unit.

No definition available.

Name:	hall_ContingencyValueInPenaltiesAndInterest
Namespace Prefix:	hall_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration