SCHEDULE II - VALUATION AND QUALIFYING ACCOUNTS (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Allowance for Doubtful Accounts [Member]
Valuation and Qualifying Accounts Disclosure [Line Items]
Balance at beginning of period		$ 1,747	$ 1,989	$ 941
Charged to costs and expenses		(163)	295	1,434
Charged to other accounts	[1]	281	303	0
Deductions	[2]	(84)	(840)	(386)
Balance at end of period		1,781	1,747	1,989
Allowance for Excess and Obsolete Inventory [Member]
Valuation and Qualifying Accounts Disclosure [Line Items]
Balance at beginning of period		5,268	6,809	3,941
Charged to costs and expenses		3,513	2,186	4,438
Charged to other accounts	[1]	185	(59)	(1)
Deductions	[2]	(2,703)	(3,668)	(1,569)
Balance at end of period		6,263	5,268	6,809
Deferred Tax Assets - Valuation Allowances [Member]
Valuation and Qualifying Accounts Disclosure [Line Items]
Balance at beginning of period		6,635	6,692	1,955
Charged to costs and expenses		887	456	4,766
Charged to other accounts	[1]	0	0	0
Deductions	[2]	(37)	(513)	(29)
Balance at end of period		$ 7,485	$ 6,635	$ 6,692

[1] Includes foreign currency translation adjustments

[2] Write offs