Credit Risk (Changes in the Allowance for Doubtful Accounts) (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015
Allowance for Doubtful Accounts Receivable [Roll Forward]
Balance at beginning of period	$ 1,060
(Reversed) to expense	(17)	$ 21
Write-offs, net of amounts recovered	(60)
Foreign currency translation adjustment	5
Balance at end of period	$ 988