Schedule II Valuation and Qualifying Accounts (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Allowance for doubtful accounts and returns
Changes in Valuation and Qualifying Accounts
Balance at Beginning of Period	$ 390	$ 404	$ 305
Charged to Costs and Expenses			96
Deductions	(390)
Other		(14)	3
Balance at End of Period		390	404
Inventory reserves
Changes in Valuation and Qualifying Accounts
Balance at Beginning of Period	23,642	25,091	33,601
Charged to Costs and Expenses	1,185	1,003	2,562
Deductions	(14,362)	(2,452)	(10,913)
Other			(159)
Balance at End of Period	$ 10,465	$ 23,642	$ 25,091