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STATEMENTS OF INCOME AND COMPREHENSIVE INCOME (UNAUDITED) (Parenthetical) (USD $)
3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Unrealized Losses on Marketable Securities        
Unrealized Gains (Losses) on Marketable Securities, Tax $ 0 $ 404,000 $ 0 $ 109,000
Reclassification of Derivative Instruments Included in Income, Tax $ 0 $ 111,000 $ 39,000 $ 212,000