Property and Equipment: (Details) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Property, Plant and Equipment [Line Items]
Total property and equipment, cost	$ 225,082	$ 224,714
Accumulated depreciation	(146,314)	(138,623)
Net property and equipment	78,768	86,091	[1]
Machinery and Equipment [Member]
Property, Plant and Equipment [Line Items]
Total property and equipment, cost	92,664	90,744
Land, Buildings and Improvements [Member]
Property, Plant and Equipment [Line Items]
Total property and equipment, cost	66,519	71,415
Molds [Member]
Property, Plant and Equipment [Line Items]
Total property and equipment, cost	33,862	33,166
Computer Equipment and Software [Member]
Property, Plant and Equipment [Line Items]
Total property and equipment, cost	23,050	23,228
Furniture and Fixtures [Member]
Property, Plant and Equipment [Line Items]
Total property and equipment, cost	3,587	3,571
Construction in Progress [Member]
Property, Plant and Equipment [Line Items]
Total property and equipment, cost	$ 5,400	$ 2,590

[1] December 31, 2014 balances were derived from audited consolidated financial statements.