Credit Risk (Changes in the Allowance for Doubtful Accounts) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Allowance for Doubtful Accounts Receivable [Roll Forward]
Balance at beginning of period	$ 1,060
Provision for doubtful accounts	7	$ 37
Write-offs, net of amounts recovered	(17)
Foreign currency translation adjustment	4
Balance at end of period	$ 1,054