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Trading Securities (Tables)
9 Months Ended
Sep. 30, 2012
Schedule of Trading Securities and Other Trading Assets [Line Items]  
Schedule of Trading Securities
The following table presents trading securities as of September 30, 2012 and December 31, 2011.
(in thousands)
September 30,
2012
December 31,
2011
TLGP investments
$

$
250,080

U.S. Treasury bills
1,109,878

729,994

Mutual funds offsetting deferred compensation
4,137

4,211

Total
$
1,114,015

$
984,285


Categories of Investments, Marketable Securities, Trading Securities [Member]
 
Schedule of Trading Securities and Other Trading Assets [Line Items]  
Net Gains (Losses) on Trading Securities
The following table presents net gains (losses) on trading securities for the third quarter and the first nine months of 2012 and 2011.
 
Three months ended September 30,
Nine months ended September 30,
(in thousands)
2012
2011
2012
2011
Net unrealized gains (losses) on trading securities held at
   period-end
$
168

$
(535
)
$
408

$
(348
)
Net realized gains (losses) on securities sold/matured
   during the period
20

(15
)
(74
)
(64
)
Net gains (losses) on trading securities
$
188

$
(550
)
$
334

$
(412
)