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Quarterly Results of Operations (Unaudited) (Tables)
 12 Months Ended
Dec. 31, 2017
Quarterly Financial Data [Abstract]  
Schedule of Quarterly Financial Information
The unaudited quarterly results of operations for the years ended December 31, 2017 and 2016 are summarized in the table below:
 
 
Three months ended
 
 
March 31
 
June 30
 
September 30
 
December 31
 
 
(in thousands)
2017 (1)
 
 
 
 
 
 
 
 
Total revenues
 
$
210,959

 
$
270,721

 
$
(24,256
)
 
$
209,390

Total benefits and expenses
 
189,338

 
(67,282
)
 
193,689

 
180,806

Income (loss) from operations before income taxes and equity in earnings of operating joint venture
 
21,621

 
338,003

 
(217,945
)
 
28,584

Net income (loss)
 
$
40,072

 
$
349,164

 
$
(178,496
)
 
$
113,692

2016 (2)
 
 
 
 
 
 
 
 
Total revenues
 
$
791,393

 
$
140,925

 
$
231,010

 
$
47,874

Total benefits and expenses
 
1,163,700

 
(588,114
)
 
182,006

 
132,262

Income (loss) from operations before income taxes and equity in earnings of operating joint venture
 
(372,307
)
 
729,039

 
49,004

 
(84,388
)
Net income (loss)
 
$
(328,199
)
 
$
723,984

 
$
84,897

 
$
(85,465
)