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Quarterly Results of Operations (Unaudited) (Tables)
 12 Months Ended
Dec. 31, 2015
Quarterly Financial Data [Abstract]  
Schedule of Quarterly Financial Information
The unaudited quarterly results of operations for the years ended December 31, 2015 and 2014 are summarized in the table below:
 
 
March 31
 
June 30
 
September 30
 
December 31
 
 
(in thousands)
2015
 
 
 
 
 
 
 
 
Total revenues
 
$
834,751

 
$
601,723

 
$
763,484

 
$
662,989

Total benefits and expenses
 
737,175

 
365,588

 
919,188

 
336,103

Income (loss) from operations before income taxes
 
97,576

 
236,135

 
(155,704
)
 
326,886

Net income (loss)
 
$
84,230

 
$
214,429

 
$
(134,103
)
 
$
348,342

2014
 
 
 
 
 
 
 
 
Total revenues
 
$
815,709

 
$
782,985

 
$
687,949

 
$
807,454

Total benefits and expenses
 
469,135

 
483,283

 
512,624

 
702,879

Income (loss) from operations before income taxes
 
346,574

 
299,702

 
175,325

 
104,575

Net income (loss)
 
$
279,170

 
$
249,068

 
$
172,179

 
$
85,386