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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) (Unaudited) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Net income $ 129,705 $ 7,165 $ 102,561 $ 8,540
Unrealized gain from derivatives, net of benefit from income taxes of $161        (298)
Net change in unrealized gains and losses on marketable securities, net of benefit from income taxes of $682, $2,380 and $7,475    (1,268) (4,418) (13,880)
Other comprehensive loss    (1,268) (4,418) (14,178)
Comprehensive income (loss) $ 129,705 $ 5,897 $ 98,143 $ (5,638)