Valuation And Qualifying Accounts (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Reserves For Doubtful Accounts [Member]
Valuation and Qualifying Accounts Disclosure [Line Items]
Balance at Beginning of Year		$ 4,306	$ 3,533	$ 2,632
Charges to Costs and Expenses		2,200	2,035	1,601
Write-Offs/Cash Payments		(817)	(1,146)	(762)
Foreign Currency Translation		(561)	(116)	62
Balance at End of Year		5,128	4,306	3,533
Valuation Allowance For Deferred Tax [Member]
Valuation and Qualifying Accounts Disclosure [Line Items]
Balance at Beginning of Year		4,678	5,201	4,547
Charges to Costs and Expenses		634	799	735
Charges to Other Accounts	[1]			742
Write-Offs/Cash Payments		(468)	(1,042)	(701)
Foreign Currency Translation		(398)	(280)	(122)
Balance at End of Year		$ 4,446	$ 4,678	$ 5,201

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