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Other Income (Loss), Net (Tables)
 12 Months Ended
Dec. 31, 2014
Other Income and Expenses [Abstract]  
Other Income (Loss), Net
 
Year Ended December 31,
 
2014
 
2013
 
2012
 
(In thousands)
Loss on repurchase of convertible debentures
$
—

 
$
—

 
$
(7,895
)
Gain on sale of ownership interests in companies and funds, net
31,835

 
—

 
9,004

Gain (loss) on mark-to-market of holdings in fair value method partner companies
—

 
(915
)
 
11,035

Impairment charges on cost method partner companies and private equity funds
(54
)
 
(250
)
 
(350
)
Gain on mark-to-market of Penn Mezzanine warrants
—

 
1,146

 
264

Impairment charges on Penn Mezzanine loan and equity participations
—

 
(295
)
 
(2,489
)
Other than temporary impairment on available-for-sale securities
(14
)
 
(43
)
 
(260
)
Other
(110
)
 
740

 
29

 
$
31,657

 
$
383

 
$
9,338