Allowance For Doubtful Accounts - Rollforward (Details) (Allowance for Doubtful Accounts [Member], USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Allowance for Doubtful Accounts [Member]
Valuation and Qualifying Accounts Disclosure [Line Items]
Beginning Balance	$ 6,399	$ 4,569	$ 4,278
Charged to Costs and Expenses	1,136	2,072	855
Write-Offs Charged to Allowance	(407)	(737)	(607)
Effect of Exchange Rate Changes	5	495	43
Ending Balance	$ 7,133	$ 6,399	$ 4,569