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Summary of Accounting Policies (Cash and Cash Equivalents) (Details) (USD $)	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Cash and Cash Equivalents [Line Items]
Cash and cash equivalents	$ 31,649,000	$ 10,300,000	$ 15,301,000	$ 6,841,000
Cash and cash equivalents which exceeded federally-insured limits	22,200,000hnh_CashExceedingFdicInsuredAmount
Cash Held in Foreign Banks
Cash and Cash Equivalents [Line Items]
Cash and cash equivalents	$ 8,600,000	$ 6,500,000

Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation.

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