Retirement and Other Employee Benefits (Tables)

6 Months Ended

Jun. 30, 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 and six months ended June 30, 2016 and 2015 were as follows:

	Qualified Pension Benefits									Nonqualified Pension Benefits (1)					Retirement Health Benefits
	For the Three Months Ended June 30,									For the Three Months Ended June 30,					For the Three Months Ended June 30,
	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	—			325			3,325			300			725		—			—
Curtailment/settlement charge	—			—			—			—			400		—			—
Net periodic benefit (gain) cost	$	(4,400	)	$	(2,125	)	$	8,400		$	1,325		$	3,800	$	125		$	525
	Qualified Pension Benefits									Nonqualified Pension Benefits (1)					Retirement Health Benefits
	For the Six Months Ended June 30,									For the Six Months Ended June 30,					For the Six Months Ended June 30,
	2016 Plan 1			2016 Plan 2			2015			2016			2015		2016			2015
Service cost	$	—		$	—		$	19,500		$	200		$	2,250	$	—		$	1,250
Interest cost	6,800			7,000			18,100			1,850			2,700		1,750			1,900
Expected return on plan assets	(15,600		)	(11,900		)	(27,450		)	—			—		(1,500		)	(1,650		)
Amortization of prior service cost	—			—			—			—			400		—			(450		)
Amortization of net loss	—			650			6,650			600			1,450		—			—
Curtailment/settlement (gain) charge	(23,057		)	—			—			(2,285		)	800		(4,236		)	—
Net periodic benefit (gain) cost	$	(31,857	)	$	(4,250	)	$	16,800		$	365		$	7,600	$	(3,986	)	$	1,050

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