Property and Equipment: (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2011	Dec. 31, 2010
Property, Plant and Equipment [Line Items]
Total property and equipment, cost	$ 183,552	$ 169,597
Accumulated depreciation	(96,834)	(86,052)
Net property and equipment	86,718	83,545	[1]
Machinery and Equipment [Member]
Property, Plant and Equipment [Line Items]
Total property and equipment, cost	73,217	62,680
Land, Buildings and Improvements [Member]
Property, Plant and Equipment [Line Items]
Total property and equipment, cost	61,772	57,810
Molds [Member]
Property, Plant and Equipment [Line Items]
Total property and equipment, cost	23,864	22,521
Computer Equipment and Software [Member]
Property, Plant and Equipment [Line Items]
Total property and equipment, cost	16,749	14,613
Furniture and Fixtures [Member]
Property, Plant and Equipment [Line Items]
Total property and equipment, cost	2,285	2,107
Construction in Progress [Member]
Property, Plant and Equipment [Line Items]
Total property and equipment, cost	$ 5,665	$ 9,866

[1] December 31, 2010 balances were derived from audited consolidated financial statements.