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 [Member]
Movement in Valuation Allowances and Reserves
Balance at beginning of period		$ 6,475		$ 5,654		$ 4,080
Additions - Charged to costs and expenses		1,597		1,505		2,447
Additions - Charged to other accounts		0	[1]	0	[1]	199
Deductions	[2]	(953)		(633)		(1,149)
Translations		154		51		(77)
Balance at end of period		6,965		6,475		5,654
Inventory Valuation Reserve [Member]
Movement in Valuation Allowances and Reserves
Balance at beginning of period		5,233		6,556		4,078
Additions - Charged to costs and expenses		14,802		4,087		2,010
Additions - Charged to other accounts		0		0	[1]	675	[1]
Deductions	[3]	(8,351)		(5,158)		(313)
Translations		415		252		106
Balance at end of period		11,269		5,233		6,556
Valuation Allowance of Deferred Tax Assets [Member]
Movement in Valuation Allowances and Reserves
Balance at beginning of period		1,982		1,250		1,766
Additions - Charged to costs and expenses		7,190		1,089		339
Additions - Charged to other accounts		0		0		0
Deductions		(129)	[4]	(290)	[4]	(879)
Translations		201		67		(24)
Balance at end of period		$ 8,842		$ 1,982		$ 1,250

[1] Reserves at date of acquisition of subsidiary or subsidiaries.

[2] Reversal of amounts previously recorded as bad debt and uncollectible accounts written off.

[3] Inventory items written off against the allowance.

[4] Deductions to the deferred tax assets valuation allowance relate to decreased deferred tax assets and the release of the valuation allowance.