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Summary of Significant Accounting Policies Share Based Payments (Details)
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Share-based Compensation, Additional Disclosures      
Pre-vesting forfeitures percent 10.00%halo_ShareBasedCompensationArrangementByShareBasedPaymentAwardPreVestingForfeituresPercent 10.00%halo_ShareBasedCompensationArrangementByShareBasedPaymentAwardPreVestingForfeituresPercent 10.00%halo_ShareBasedCompensationArrangementByShareBasedPaymentAwardPreVestingForfeituresPercent