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Other Comprehensive Income (Schedule Of The Tax Effects Allocated To Each Component Of Other Comprehensive Income) (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2012
Mar. 31, 2011
Other Comprehensive Income [Abstract]    
Unrealized gain on derivative instrument   $ 115
Income tax expense   44
Unrealized gain on derivative instrument, net of tax   71
Unrealized gain on available-for-sale securities 25 11
Income tax expense 9 4
Unrealized gain on available-for-sale securities, net of tax 16 7
Other comprehensive income $ 16 $ 78