Valuation And Qualifying Accounts (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012		Dec. 31, 2011		Dec. 31, 2010
Allowance for Doubtful Accounts [Member]
Valuation and Qualifying Accounts Disclosure [Line Items]
Balance at beginning of Year	$ 223		$ 219		$ 226
"Addition" charged to costs and expense	1		5		50
"Less" deductions	70	[1]	1	[1]	57	[1]
Balance at end of year	154		223		219
Deferred Tax Asset Valuation Allowance [Member]
Valuation and Qualifying Accounts Disclosure [Line Items]
Balance at beginning of Year	9,010		8,361		8,760
"Addition" charged to costs and expense			649		1,069
"Less" deductions	264				1,468
Balance at end of year	$ 8,746		$ 9,010		$ 8,361

[1] Uncollectible accounts written off.