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Allowance for Doubtful Accounts, Sales Returns and Discounts (Tables)

12 Months Ended

Dec. 31, 2015

Allowance For Doubtful Accounts Sales Returns And Discounts [Abstract]

Schedule Of Allowance For Doubtful Accounts, Sales Returns And Discounts [Table Text Block]

The activity in the allowance for doubtful accounts, sales returns and discounts for the years ended December 31, 2013, 2014 and 2015 is as follows:

Allowance for doubtful accounts

		Balance at									Balance at
		beginning			Charges to			Amounts			end of
Period		of year			earnings			utilized			year
		(in thousands)

Year 2013		$	15,186			173			-			15,359
Year 2014		$	15,359			554			(15,186)			727
Year 2015		$	727			310			(262)			775

Allowance for sales returns and discounts

		Balance at									Balance at
		beginning						Amounts			end of
Period		of year			Additions			utilized			year
		(in thousands)

Year 2013		$	1,078			7,272			(7,421)			929
Year 2014		$	929			5,168			(5,229)			868
Year 2015		$	868			8,887			(8,982)			773