Credit Risk (Changes in the Allowance for Doubtful Accounts) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Allowance for Doubtful Accounts Receivable [Roll Forward]
Balance at beginning of period	$ 2,183
Charged to expense	(77)	185
Write-offs	0
Foreign currency translation adjustment	(3)
Balance at end of period	$ 2,103