SCHEDULE II: VALUATION AND QUALIFYING ACCOUNTS (Details) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Sales and return allowances, discounts, chargebacks and rebates:
Movement in valuation and qualifying accounts
Balance at Beginning of Year	$ 15,159,000	$ 12,559,000	$ 8,092,000
Additions Charged as a Reduction to Revenue	28,743,000	12,872,000	12,960,000
Additions Change in Deferred Revenue		(611,000)	516,000
Deductions	(24,172,000)	(9,661,000)	(9,009,000)
Balance at End of Year	19,730,000	15,159,000	12,559,000
Deferred tax assets valuation allowance:
Movement in valuation and qualifying accounts
Balance at Beginning of Year	42,500,000	34,700,000	62,300,000
Additions Charged as a Reduction to Revenue		7,800,000
Deductions	(39,830,000)		(27,600,000)
Balance at End of Year	2,670,000	42,500,000	34,700,000
Reversed valuation allowance	39,800,000
Valuation allowance reduced due to a reduction in the Company's deferred tax assets			$ 27,600,000