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	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Allowance for Doubtful Accounts Receivable [Roll Forward]
Balance, beginning of year	$ 2,610	$ 3,327	$ 3,552
Charges to expense	3,387	1,344	1,874
Recoveries	(7)	(1,654)	(1,760)
Write-offs	(1,970)	(153)	(285)
Foreign exchange and other	(274)	(254)	(54)
Balance, end of year	$ 3,746	$ 2,610	$ 3,327