CONSOLIDATED STATEMENTS OF OPERATIONS (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		12 Months Ended
	Mar. 31, 2014		Mar. 31, 2015	Dec. 31, 2013	Dec. 31, 2012
CONSOLIDATED STATEMENTS OF OPERATIONS [Abstract]
Net sales	$ 56,886	[1]	$ 339,149	$ 553,615	$ 581,288
Cost of sales	35,763		244,667	337,565	336,344
Gross profit	21,123	[1]	94,482	216,050	244,944
Operating expenses:
Selling, general and administrative	24,699		88,869	86,232	89,599
Research and development	9,122		35,990	35,938	36,627
Advertising	3,258		42,919	48,280	43,023
Goodwill impairment			19,549
Impairment of long-lived assets			36,461
Depreciation and amortization	2,686		11,330	10,678	11,629
Total operating expenses	39,765	[1]	235,118	181,128	180,878
Income (loss) from operations	(18,642)	[1]	(140,636)	34,922	64,066
Other income (expense):
Interest income	19		90	68	241
Interest expense	(1)		(16)		(50)
Other, net	(231)		(667)	(1,149)	(2,309)
Total other expense, net	(213)		(593)	(1,081)	(2,118)
Income (loss) before income taxes	(18,855)		(141,229)	33,841	61,948
Provision for (benefit from) income taxes	(7,072)		77,543	(50,168)	(24,504)
Net income (loss)	$ (11,783)		$ (218,772)	$ 84,009	$ 86,452
Net income (loss) per share:
Class A and B - basic	$ (0.17)	[1]	$ (3.12)	$ 1.23	$ 1.29
Class A and B - diluted	$ (0.17)	[1]	$ (3.12)	$ 1.19	$ 1.24
Weighted-average shares used to calculate net income (loss) per share:
Class A and B - basic	69,408		70,071	68,411	67,100
Class A and B - diluted	69,408		70,071	70,402	69,720

[1] Includes a tax provision due to the increase of valuation allowance. Refer to Note 11 - "Income Taxes" for additional information.