Property and Equipment: (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2011	Dec. 31, 2010
Property, Plant and Equipment [Line Items]
Total property and equipment, cost	$ 180,794	$ 169,597
Accumulated depreciation	(93,233)	(86,052)
Net property and equipment	87,561	83,545	[1]
Machinery and Equipment [Member]
Property, Plant and Equipment [Line Items]
Total property and equipment, cost	70,150	62,680
Land, Buildings and Improvements [Member]
Property, Plant and Equipment [Line Items]
Total property and equipment, cost	62,119	57,810
Molds [Member]
Property, Plant and Equipment [Line Items]
Total property and equipment, cost	22,808	22,521
Computer Equipment and Software [Member]
Property, Plant and Equipment [Line Items]
Total property and equipment, cost	16,544	14,613
Furniture and Fixtures [Member]
Property, Plant and Equipment [Line Items]
Total property and equipment, cost	2,241	2,107
Construction in Progress [Member]
Property, Plant and Equipment [Line Items]
Total property and equipment, cost	$ 6,932	$ 9,866

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