Employee Benefit Plans

9 Months Ended

Sep. 30, 2015

Compensation and Retirement Disclosure [Abstract]

Employee Benefit Plans

Employee Benefit Plans

Net periodic cost (benefit) of the Defined Benefit Pension, Post-Retirement Medical, and Supplemental Executive Retirement plans included in general insurance expenses in the accompanying condensed consolidated statements of income includes the following components:

	Three Months Ended September 30,
	Defined Benefit  Pension Plan						Post-Retirement  Medical Plan						Supplemental Executive Retirement Plan				Total
	2015			2014			2015			2014			2015		2014		2015			2014
Components of net periodic cost (benefit):
Service cost	$	1,521		$	1,364		$	254		$	327		$	70	$	30	$	1,845		$	1,721
Interest cost	5,996			5,824			167			171			531		503		6,694			6,498
Expected return on plan assets	(7,084		)	(7,328		)	—			—			—		—		(7,084		)	(7,328		)
Amortization of unrecognized prior service costs (benefits)	3			12			(395		)	(427		)	233		234		(159		)	(181		)
Amortization of losses (gains) from earlier periods	3,086			885			16			(77		)	166		165		3,268			973
Settlement	—			—			—			—			—		2,666		—			2,666
Net periodic cost (benefit)	$	3,522		$	757		$	42		$	(6	)	$	1,000	$	3,598	$	4,564		$	4,349

	Nine Months Ended September 30,
	Defined Benefit  Pension Plan						Post-Retirement  Medical Plan						Supplemental Executive Retirement Plan				Total
	2015			2014			2015			2014			2015		2014		2015			2014
Components of net periodic cost (benefit):
Service cost	$	4,538		$	3,713		$	781		$	739		$	211	$	440	$	5,530		$	4,892
Interest cost	17,990			17,301			420			431			1,592		1,896		20,002			19,628
Expected return on plan assets	(21,258		)	(21,966		)	—			—			—		—		(21,258		)	(21,966		)
Amortization of unrecognized prior service costs (benefits)	10			38			(1,230		)	(1,280		)	700		700		(520		)	(542		)
Amortization of losses (gains) from earlier periods	9,298			2,174			(298		)	(337		)	497		350		9,497			2,187
Settlement	—			—			—			—			—		2,666		—			2,666
Net periodic cost (benefit)	$	10,578		$	1,260		$	(327	)	$	(447	)	$	3,000	$	6,052	$	13,251		$	6,865

The Company expects to make payments of approximately $1,466 with respect to its Post-Retirement Medical Plan and $4,825 with respect to its Supplemental Executive Retirement Plan during the year ended December 31, 2015.  The Company expects to make contributions of zero to its Defined Benefit Pension Plan during the year ended December 31, 2015.  A December 31 measurement date is used for the employee benefit plans.

The following table summarizes contributions to the Defined Benefit Pension Plan and payments made to the Post-Retirement Medical Plan and the Supplemental Executive Retirement Plan:

	Three Months Ended September 30,				Nine Months Ended September 30,
	2015		2014		2015		2014
Contributions to the Defined Benefit Pension Plan	$	—	$	6,003	$	—	$	10,717
Payments to the Post-Retirement Medical Plan	576		178		1,100		393
Payments to the Supplemental Executive Retirement Plan	830		14,255		3,995		16,044