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Quarterly Results of Operations (Unaudited) (Tables)
 12 Months Ended
Dec. 31, 2016
Quarterly Financial Data [Abstract]  
Schedule of Quarterly Financial Information
The unaudited quarterly results of operations for the years ended December 31, 2016 and 2015 are summarized in the table below:

 
Three Months Ended
 
March 31
 
June 30
 
September 30
 
December 31
 
 
 
 
 
 
 
 
2016
(in thousands)
Total revenues
$
201,095

 
$
(892,563
)
 
$
719,985

 
$
(181,460
)
Total benefits and expenses
429,590

 
1,215,062

 
(149,250
)
 
122,236

Income (loss) from operations before income taxes
(228,495
)
 
(2,107,625
)
 
869,235

 
(303,696
)
Net income (loss)
$
(142,665
)
 
$
(1,316,230
)
 
$
569,649

 
$
(200,842
)
2015
 
 
 
 
 
 
 
Total revenues
$
305,682

 
$
279,135

 
$
268,802

 
$
219,952

Total benefits and expenses
331,751

 
122,886

 
388,581

 
65,421

Income (loss) from operations before income taxes
(26,069
)
 
156,249

 
(119,779
)
 
154,531

Net income (loss)
$
(21,302
)
 
$
131,914

 
$
(104,826
)
 
$
167,431