Income Taxes (Schedule Of Expected Expiration Dates Of Tax Loss CarryForwards) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010
Expiration Dates [Line Items]
Tax Benefit	$ 26,952	$ 32,375
Valuation Allowance	(11,760)	(19,687)
Net Tax Benefit	15,192	12,688
2011 [Member]
Expiration Dates [Line Items]
Tax Benefit		561
Valuation Allowance		(561)
2012 [Member]
Expiration Dates [Line Items]
Tax Benefit	205	197
Valuation Allowance	(205)	(197)
2013 [Member]
Expiration Dates [Line Items]
Tax Benefit	277	462
Valuation Allowance	(242)	(462)
Net Tax Benefit	35
2014 [Member]
Expiration Dates [Line Items]
Tax Benefit	215	58
Valuation Allowance	(215)	(58)
2015 [Member]
Expiration Dates [Line Items]
Tax Benefit	391	346
Valuation Allowance	(112)	(115)
Net Tax Benefit	279	231
2016 [Member]
Expiration Dates [Line Items]
Tax Benefit	344	203
Valuation Allowance	(116)
Net Tax Benefit	228	203
2017 [Member]
Expiration Dates [Line Items]
Tax Benefit
Valuation Allowance
Net Tax Benefit
2018 [Member]
Expiration Dates [Line Items]
Tax Benefit	41	25
Net Tax Benefit	41	25
2019 [Member]
Expiration Dates [Line Items]
Tax Benefit	124	59
Net Tax Benefit	124	59
2023 [Member]
Expiration Dates [Line Items]
Tax Benefit	505	234
Net Tax Benefit	505	234
2024 [Member]
Expiration Dates [Line Items]
Tax Benefit	674	695
Net Tax Benefit	674	695
2027 [Member]
Expiration Dates [Line Items]
Tax Benefit	265	434
Valuation Allowance		(434)
Net Tax Benefit	265
2028 [Member]
Expiration Dates [Line Items]
Tax Benefit	147	158
Valuation Allowance		(158)
Net Tax Benefit	147
2029 [Member]
Expiration Dates [Line Items]
Tax Benefit	213	230
Valuation Allowance		(230)
Net Tax Benefit	213
2030 [Member]
Expiration Dates [Line Items]
Tax Benefit
Valuation Allowance
Net Tax Benefit
2031 [Member]
Expiration Dates [Line Items]
Tax Benefit
Valuation Allowance
Net Tax Benefit
Indefinite Life [Member]
Expiration Dates [Line Items]
Tax Benefit	23,551	28,713
Valuation Allowance	(10,870)	(17,472)
Net Tax Benefit	$ 12,681	$ 11,241