Accounts Receivable (Impact Of Allowance For Doubtful Accounts On The Gross Trade Accounts Receivable Balances) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2011	Mar. 31, 2012	Dec. 31, 2011
Accounts Receivable [Abstract]
Balance at beginning of period	$ (1)	$ (100)	$ (100)
Additions - charge to expense	1
Adjustments and/or deductions
Balance at end of period		$ (100)	$ (100)