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Inventories: (Details) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2011
Dec. 31, 2010
Inventory Disclosure [Abstract]    
Raw material $ 26,270 $ 22,805
Work in process 4,224 3,806
Finished goods 18,878 17,445
Total $ 49,372 $ 44,056 [1]
[1] December 31, 2010 balances were derived from audited consolidated financial statements.