Credit Risk (Changes in the Allowance for Doubtful Accounts) (Details) (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013
Allowance for Doubtful Accounts Receivable [Roll Forward]
Balance at beginning of period	$ 2,183
Charged (reversed) to expense	80	323
Write-offs, net of amounts recovered	(69)
Foreign currency translation adjustment	(87)
Balance at end of period	$ 2,107