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Retirement and Other Employee Benefits (Tables)
 3 Months Ended
Mar. 31, 2016
Defined Benefit Pension Plans and Defined Benefit Postretirement Plans Disclosure [Abstract]  
Components of Net Periodic Benefit Cost
The components of net periodic benefit (gain) cost for the Company’s qualified pension benefits plan, nonqualified pension benefits plan and retirement health benefits plan for the three months ended March 31, 2016 and 2015 were as follows: 
 
Qualified Pension
Benefits
 
Nonqualified Pension
Benefits (1)
 
Retirement Health
Benefits
 
For the Three Months Ended March 31,
 
For the Three Months Ended March 31,
 
For the Three Months Ended March 31,
 
2016 Plan 1
2016 Plan 2
 
2015
 
2016
 
2015
 
2016
 
2015
Service cost
$
—

$
—

 
$
9,750

 
$
100

 
$
1,125

 
$
—

 
$
625

Interest cost
3,400

3,500

 
9,050

 
925

 
1,350

 
875

 
950

Expected return on plan assets
(7,800
)
(5,950
)
 
(13,725
)
 
—

 
—

 
(750
)
 
(825
)
Amortization of prior service cost
—

—

 
—

 
—

 
200

 
—

 
(225
)
Amortization of net loss (gain)
—

325

 
3,325

 
300

 
725

 
—

 
—

Curtailment/settlement (gain) charge
(23,057
)
—

 
—

 
(2,285
)
 
400

 
(4,236
)
 
—

Net periodic benefit (gain) cost
$
(27,457
)
$
(2,125
)
 
$
8,400

 
$
(960
)
 
$
3,800

 
$
(4,111
)
 
$
525

 
(1)
The Company’s nonqualified plan is unfunded.