Accounts And Other Receivables (Schedule Of Reconciliation Of The Beginning And Ending Balances Of The Allowance For Doubtful Accounts And Sales Returns) (Details) (Allowance For Doubtful Accounts, USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Allowance For Doubtful Accounts
Allowance for Doubtful Accounts Receivable [Roll Forward]
Balance, beginning of year	$ 3,327	$ 3,552	$ 3,539
Charges to expense	1,344	1,874	1,589
Recoveries	(1,654)	(1,760)	(1,076)
Write-offs	(153)	(285)	(588)
Foreign exchange and other	(254)	(54)	88
Balance, end of year	$ 2,610	$ 3,327	$ 3,552