SCHEDULE II VALUATION AND QUALIFYING ACCOUNTS (Details) (USD $)	12 Months Ended
	Dec. 31, 2014		Dec. 31, 2013		Dec. 31, 2012
Allowance for doubtful accounts
Movement in valuation and qualifying accounts
Balance at Beginning of Year	$ 5,677,000		$ 5,514,000		$ 4,203,000
Additions Charged to Expenses (Income)	2,494,000		1,253,000		1,443,000
Charge-Offs	972,000		1,072,000		133,000
Other	(2,000)	[1]	(18,000)	[1]	1,000	[1]
Balance at End of Year	7,197,000		5,677,000		5,514,000
Reserve for inventory valuation
Movement in valuation and qualifying accounts
Balance at Beginning of Year	7,202,000		6,916,000		7,743,000
Additions Charged to Expenses (Income)	1,761,000		2,043,000		1,309,000
Charge-Offs	508,000		1,734,000		2,146,000
Other	(51,000)	[1]	(23,000)	[1]	10,000	[1]
Balance at End of Year	8,404,000		7,202,000		6,916,000
Valuation allowance for deferred income tax assets
Movement in valuation and qualifying accounts
Balance at Beginning of Year	8,991,000		7,798,000		7,385,000
Additions Charged to Expenses (Income)	254,000		889,000		646,000
Charge-Offs	0		0		0
Other	(1,344,000)	[1]	304,000	[1]	(233,000)	[1]
Balance at End of Year	$ 7,901,000		$ 8,991,000		$ 7,798,000

[1] Primarily the impact of currency changes