Valuation And Qualifying Accounts (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Allowance For Doubtful Accounts [Member]
Valuation and Qualifying Accounts Disclosure [Line Items]
Balance at beginning of year	$ 586	$ 375	$ 209
Additions	786	297	505
Deductions	946	86	339
Balance at end of year	426	586	375
Tax Valuation Allowance [Member]
Valuation and Qualifying Accounts Disclosure [Line Items]
Balance at beginning of year	15,936	34,022	37,903
Deductions	4,406	18,086	3,881
Balance at end of year	$ 11,530	$ 15,936	$ 34,022