SCHEDULE II - VALUATION AND QUALIFYING ACCOUNTS (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Allowance for doubtful accounts, sales returns and cash discounts
Changes to valuation allowance
Balance at beginning of period	$ 2,926	$ 1,430	$ 1,893
Charged to cost and expenses	2,652	4,894	9,148
Deductions	(3,874)	(3,398)	(9,611)
Balance at end of period	1,707	2,926	1,430
Allowance on Deferred Tax Assets
Changes to valuation allowance
Balance at beginning of period	24,130	12,579	7,592
Charged to cost and expenses	(4,344)	11,551	6,142
Deductions			(1,155)
Balance at end of period	$ 19,786	$ 24,130	$ 12,579

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Total of allowances and reserves, the valuation and qualifying accounts that are either netted against the cost of an asset (in order to value it at its carrying value) or that reflect a liability established to represent expected future costs.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 235

-SubTopic 10

-Section S99

-Paragraph 4

-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e24092-122690

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 09

-Article 12

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- Definition

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- Definition

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