SCHEDULE II: VALUATION AND QUALIFYING ACCOUNTS (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Movement in valuation and qualifying accounts
(Reversed) recorded valuation allowance	$ 1,600,000
Sales and return allowances, discounts, chargebacks and rebates:
Movement in valuation and qualifying accounts
Balance at Beginning of Year	19,730,000	15,159,000	12,559,000
Additions Charged as a Reduction to Revenue	73,898,000	28,743,000	12,872,000
Additions Change in Deferred Revenue			(611,000)
Deductions	(57,351,000)	(24,172,000)	(9,661,000)
Balance at End of Year	36,277,000	19,730,000	15,159,000
Deferred tax assets valuation allowance:
Movement in valuation and qualifying accounts
Balance at Beginning of Year	2,670,000	42,500,000	34,700,000
Additions Charged as a Reduction to Revenue			7,800,000
Deductions	1,640,000	(39,830,000)
Balance at End of Year	4,310,000	2,670,000	42,500,000
(Reversed) recorded valuation allowance		$ (39,800,000)