Property and Equipment: (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2012	Dec. 31, 2011
Property, Plant and Equipment [Line Items]
Total property and equipment, cost	$ 189,559	$ 182,950
Accumulated depreciation	(107,384)	(99,902)
Net property and equipment	82,175	83,048	[1]
Machinery and Equipment [Member]
Property, Plant and Equipment [Line Items]
Total property and equipment, cost	76,845	73,390
Land, Buildings and Improvements [Member]
Property, Plant and Equipment [Line Items]
Total property and equipment, cost	60,174	60,334
Molds [Member]
Property, Plant and Equipment [Line Items]
Total property and equipment, cost	26,062	24,133
Computer Equipment and Software [Member]
Property, Plant and Equipment [Line Items]
Total property and equipment, cost	17,922	17,518
Furniture and Fixtures [Member]
Property, Plant and Equipment [Line Items]
Total property and equipment, cost	2,559	2,298
Construction in Progress [Member]
Property, Plant and Equipment [Line Items]
Total property and equipment, cost	$ 5,997	$ 5,277

[1] December 31, 2011 balances were derived from audited consolidated financial statements.