Valuation And Qualifying Accounts (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013		Dec. 31, 2012
Reserves For Doubtful Accounts Receivable [Member]
Valuation and Qualifying Accounts Disclosure [Line Items]
Balance at Beginning of Year	$ 3,533	$ 2,632		$ 3,239
Charges to Costs and Expenses	2,035	1,601		1,108
Write-Offs/Cash Payments	(1,146)	(762)		(1,732)
Foreign Currency Translation	(116)	62		17
Balance at End of Year	4,306	3,533		2,632
Valuation Allowance of Deferred Tax Assets [Member]
Valuation and Qualifying Accounts Disclosure [Line Items]
Balance at Beginning of Year	5,201	4,547		4,614
Charges to Costs and Expenses	799	735		265
Valuation Allowances and Reserves, Charged to Other Accounts		742	[1]
Write-Offs/Cash Payments	(1,042)	(701)		(358)
Foreign Currency Translation	(280)	(122)		26
Balance at End of Year	$ 4,678	$ 5,201		$ 4,547

[1] Amount relates to net operating losses obtained through acquisitions where uncertainty exists as to our ability to use the tax attribute.