Schedule II-Valuation and Qualifying Accounts (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Allowance for doubtful accounts and returns
Changes in Valuation and Qualifying Accounts
Balance at Beginning of Period			$ 305	$ 411	$ 1,357
Charged to Costs and Expenses			96		(535)
Deductions				(112)	(449)
Other			2	6	38
Balance at End of Period	403	305	403	305	411
Reserve for excess and obsolete inventory
Changes in Valuation and Qualifying Accounts
Balance at Beginning of Period			33,601	22,778	27,517
Charged to Costs and Expenses		13,400	2,562	14,492	1,015
Deductions	(8,700)		(10,913)	(4,819)	(5,583)
Other			(159)	1,150	(171)
Balance at End of Period	$ 25,091	$ 33,601	$ 25,091	$ 33,601	$ 22,778