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Selected Quarterly Financial Information (Unaudited) (Tables)
12 Months Ended
Dec. 31, 2014
Quarterly Financial Information Disclosure [Abstract]  
Selected Quarterly Financial Information
 
Three Months Ended
 
March 31
 
June 30
 
September 30
 
December 31
 
(In thousands, except per share data)
2014:
 
 
 
 
 
 
 
General and administrative expense
$
5,239

 
$
5,069

 
$
4,177

 
$
4,485

Operating loss
(5,239
)
 
(5,069
)
 
(4,177
)
 
(4,485
)
Other income (loss), net
30,374

 
1,452

 
(246
)
 
77

Interest income
470

 
542

 
482

 
407

Interest expense
(1,094
)
 
(1,098
)
 
(1,103
)
 
(1,107
)
Equity income (loss)
6,808

 
(3,175
)
 
(8,962
)
 
(10,006
)
Net income (loss) before income taxes
31,319

 
(7,348
)
 
(14,006
)
 
(15,114
)
Income tax benefit (expense)

 

 

 

Net income (loss)
$
31,319

 
$
(7,348
)
 
$
(14,006
)
 
$
(15,114
)
Net income (loss) per share (a)
 
 
 
 
 
 

Basic
$
1.44

 
$
(0.35
)
 
$
(0.68
)
 
$
(0.73
)
Diluted
$
1.29

 
$
(0.35
)
 
$
(0.68
)
 
$
(0.73
)
2013:
 
 
 
 
 
 
 
General and administrative expense
$
5,374

 
$
6,715

 
$
4,835

 
$
4,720

Operating loss
(5,374
)
 
(6,715
)
 
(4,835
)
 
(4,720
)
Other income (loss), net
757

 
(2,724
)
 
(4,224
)
 
6,574

Interest income
734

 
790

 
572

 
550

Interest expense
(1,069
)
 
(1,074
)
 
(1,077
)
 
(1,083
)
Equity income (loss)
(6,987
)
 
(18,400
)
 
(9,866
)
 
22,646

Net income (loss) before income taxes
(11,939
)
 
(28,123
)
 
(19,430
)
 
23,967

Income tax benefit (expense)

 

 

 

Net income (loss)
$
(11,939
)
 
$
(28,123
)
 
$
(19,430
)
 
$
23,967

Net income (loss) per share (a)
 
 
 
 
 
 

Basic
$
(0.57
)
 
$
(1.33
)
 
$
(0.90
)
 
$
1.10

Diluted
$
(0.57
)
 
$
(1.33
)
 
$
(0.90
)
 
$
0.99

 
(a)
Per share amounts for the quarters have each been calculated separately. Accordingly, quarterly amounts may not add to the annual amounts because of differences in the average common shares outstanding during each period. Additionally, in regard to diluted per share amounts only, quarterly amounts may not add to the annual amounts because of the inclusion of the effect of potentially dilutive securities only in the periods in which such effect would have been dilutive, and because of the adjustments to net income (loss) for the dilutive effect of partner company common stock equivalents and convertible securities.