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Commitments (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Outstanding commitments to:
Purchase Commitment, Remaining Minimum Amount Committed	$ 29,856	$ 39,689
Lend funds under bridge loans	10,381us-gaap_OtherCommitment	10,567us-gaap_OtherCommitment
Total	$ 40,237hmn_InvestmentCommitmentsTotal	$ 50,256hmn_InvestmentCommitmentsTotal

Minimum amount to be expended to satisfy the terms of arrangements in which the entity has agreed to expend funds to procure goods or services, excluding long-term purchase commitments or unconditional purchase obligations.

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