Annual report pursuant to Section 13 and 15(d)

STATEMENTS OF COMPREHENSIVE INCOME (Parenthetical)

v2.4.1.9
STATEMENTS OF COMPREHENSIVE INCOME (Parenthetical) (USD $)
12 Months Ended
Dec. 31, 2012
Unrealized Losses on Marketable Securities  
Reclassification of Derivative Instruments Included in Income, Tax $ 39,000us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesTax