Accounts Receivable (Impact Of Allowance For Doubtful Accounts On The Gross Trade Accounts Receivable Balances) (Details) (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011
Accounts Receivable, Net [Abstract]
Balance at beginning of period	$ (100)	$ (1)
Additions - charge to expense	(4)	0
Adjustments and/or deductions	15	1
Balance at end of period	$ (89)	$ 0