Inventories: (Details) (USD $)
In Thousands
Sep. 30, 2011
Dec. 31, 2010
Inventory Disclosure [Abstract]  
Raw material$ 24,262$ 22,805
Work in process3,7213,806
Finished goods15,38017,445
Total$ 43,363$ 44,056[1]
[1]December 31, 2010 balances were derived from audited consolidated financial statements.