Inventories (Details) (USD $)	Mar. 31, 2015	Dec. 31, 2014
Inventories
Raw materials	$ 25,958,000	$ 26,860,000
Finished goods	75,803,000	71,586,000
Total	101,761,000us-gaap_InventoryNet	98,446,000us-gaap_InventoryNet
Reserves for obsolete and slow-moving items	$ 1,800,000us-gaap_InventoryValuationReserves	$ 2,300,000us-gaap_InventoryValuationReserves

Amount of valuation reserve for inventory.

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

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant