Inventory (Schedule of inventory) (Details) (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
Inventory Disclosure [Abstract]
Write-down for inventory	$ 1,000,000
Components of Inventory
Raw materials	12,883,000	12,490,000
Work-in-process	342,000	160,000
Finished goods	34,704,000	27,917,000
Inventories	47,929,000	40,567,000
Less reserve for excess and obsolete inventory	(2,752,000)	(2,679,000)
Inventories, net	$ 45,177,000	$ 37,888,000