Valuation And Qualifying Accounts (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Allowance For Doubtful Accounts [Member]
Valuation and Qualifying Accounts Disclosure [Line Items]
Balance at beginning of year	$ 209	$ 53	$ 58
Additions charged to costs and expenses	505	367	153
Deductions	339	211	158
Balance at end of year	375	209	53
Tax Valuation Allowance [Member]
Valuation and Qualifying Accounts Disclosure [Line Items]
Balance at beginning of year	37,903	38,461	54,513
Deductions	2,920	558	16,052
Balance at end of year	$ 34,983	$ 37,903	$ 38,461