Schedule II Valuation and Qualifying Accounts (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Valuation and Qualifying Accounts Disclosure
Balance at beginning of year		$ 3,936
Balance at end of year		3,615	$ 3,936
Allowance for Doubtful Accounts and Returns
Valuation and Qualifying Accounts Disclosure
Balance at beginning of year		3,936	4,526	$ 4,399
Charged to costs and expenses		1,087	999	1,279
Reclassification	[1]	172	0	0
Charged to other accounts	[2]	(159)	(319)	(102)
Deductions	[3]	(1,421)	(1,270)	(1,254)
Balance at end of year		3,615	3,936	4,526
Inventory Reserves
Valuation and Qualifying Accounts Disclosure
Balance at beginning of year		3,272	3,250	3,724
Charged to costs and expenses		1,728	622	1,044
Charged to other accounts	[2]	(160)	(194)	(88)
Deductions	[4]	(1,300)	(406)	(1,430)
Balance at end of year		3,540	3,272	3,250
Valuation Allowance for Deferred Tax Assets
Valuation and Qualifying Accounts Disclosure
Balance at beginning of year		5,699	7,243	4,719
Charged to costs and expenses		734	(636)	2,239
Charged to other accounts	[2]	(549)	(908)	285
Balance at end of year		$ 5,884	$ 5,699	$ 7,243

[1] Includes amount reclassified from Other Current Liabilities to Allowance for Doubtful Accounts to properly classify a customer's open receivables balance.

[2] Primarily includes impact from foreign currency fluctuations

[3] Includes accounts determined to be uncollectible and charged against reserves, net of collections on accounts previously charged against reserves.

[4] Includes inventory identified as excess, slow moving or obsolete and charged against reserves.