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

12 Months Ended

Dec. 31, 2016

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, 2014, 2015 and 2016 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 2014		$	15,359			554			(15,186)			727
Year 2015		$	727			310			(262)			775
Year 2016		$	775			620			-			1,395

Allowance for sales returns and discounts

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

Year 2014		$	929			5,168			(5,229)			868
Year 2015		$	868			8,887			(8,982)			773
Year 2016		$	773			10,624			(9,861)			1,536