Credit Risk (Changes in the Allowance for Doubtful Accounts) (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014
Allowance for Doubtful Accounts Receivable [Roll Forward]
Balance at beginning of period	$ 1,758
Charged (reversed) to expense	29	$ (43)
Write-offs, net of amounts recovered	(102)
Foreign currency translation adjustment	(57)
Balance at end of period	$ 1,628