Credit Risk (Changes in the Allowance for Doubtful Accounts) (Details) (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013
Allowance for Doubtful Accounts Receivable [Roll Forward]
Balance at beginning of period	$ 2,183
Charged (reversed) to expense	(43)	250
Write-offs, net of amounts recovered	2
Foreign currency translation adjustment	(9)
Balance at end of period	$ 2,133