Inventories (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
Mar. 31, 2015	Mar. 31, 2014
Inventory Work-in-Process [Roll Forward]
Inventory, work-in-process, beginning of period	$ 0us-gaap_InventoryWorkInProcess	$ 0us-gaap_InventoryWorkInProcess
Production	480heb_InventoryProduction	0heb_InventoryProduction
Spoilage	0heb_InventorySpoilage	0heb_InventorySpoilage
Inventory work-in-process, end of period	$ 480us-gaap_InventoryWorkInProcess	$ 0us-gaap_InventoryWorkInProcess

Amount before valuation and LIFO reserves of merchandise or goods in the production process expected to be completed within one year or operating cycle, if longer.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.6(a)(3))

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Name:	us-gaap_InventoryWorkInProcess
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant