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STATEMENTS OF INCOME AND COMPREHENSIVE INCOME (UNAUDITED) (Parenthetical) (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Unrealized Losses on Marketable Securities
Unrealized Gains (Losses) on Marketable Securities, Tax	$ 0	$ 0	$ 0	$ 109,000
Reclassification of Derivative Instruments Included in Income, Tax	$ 0	$ 119,000	$ 39,000	$ 331,000

Tax effect on reclassification adjustment for accumulated gains and losses from derivative instrument designated and qualifying as the effective portion of cash flow hedges included in accumulated comprehensive income that was realized in net income during the period.

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- Definition

Tax effect on the change in accumulated gains and losses from derivative instruments designated and qualifying as the effective portion of cash flow hedges. Includes an entity's share of an equity investee's Increase or Decrease in deferred hedging gains or losses.

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