Employee Benefit Plans (Tables)

6 Months Ended

Jun. 30, 2018

Schedule of Consolidated Net Periodic Benefit Costs

Net periodic benefit expense for the three and six months ended June 30, 2017 and 2018 was as follows (in thousands):



	Three Months Ended					Three Months Ended
	June 30, 2017					June 30, 2018
	Pension Benefits			Other Postretirement Benefits		Pension Benefits			Other Postretirement Benefits
Components of net periodic benefit costs:
Service cost	$	5,230		$	66	$	6,269		$	51
Interest cost	2,582			123		2,795			102
Expected return on plan assets	(2,646		)	—		(3,024		)	—
Amortization of prior service credit	(46		)	—		(46		)	—
Amortization of actuarial loss	1,783			200		1,569			134
Settlement cost	361			—		—			—
Net periodic benefit cost	$	7,264		$	389	$	7,563		$	287



	Six Months Ended					Six Months Ended
	June 30, 2017					June 30, 2018
	Pension Benefits			Other Postretirement Benefits		Pension Benefits			Other Postretirement Benefits
Components of net periodic benefit costs:
Service cost	$	10,248		$	131	$	21,969		$	116
Interest cost	4,932			245		9,238			208
Expected return on plan assets	(5,133		)	—		(6,002		)	—
Amortization of prior service credit	(91		)	—		(91		)	—
Amortization of actuarial loss	2,811			400		6,523			294
Settlement cost	1,726			—		—			—
Net periodic benefit cost	$	14,493		$	776	$	31,637		$	618

The service component of our net periodic benefit costs is presented in operating expense and G&A expense, and the non-service components are presented in other expense in our consolidated statements of income.

Schedule of Amounts Recognized in Other Comprehensive Loss

The changes in accumulated other comprehensive loss (“AOCL”) related to employee benefit plan assets and benefit obligations for the three and six months ended June 30, 2017 and 2018 were as follows (in thousands):



	Three Months Ended						Three Months Ended
	June 30, 2017						June 30, 2018
Gains (Losses) Included in AOCL	Pension Benefits			Other Postretirement Benefits			Pension Benefits			Other Postretirement Benefits
Beginning balance	$	(56,236	)	$	(7,681	)	$	(98,261	)	$	(6,437	)
Net actuarial gain	—			—			386			267
Amortization of prior service credit	(46		)	—			(46		)	—
Amortization of actuarial loss	1,783			200			1,569			134
Settlement cost	361			—			—			—
Ending balance	$	(54,138	)	$	(7,481	)	$	(96,352	)	$	(6,036	)



	Six Months Ended						Six Months Ended
	June 30, 2017						June 30, 2018
Gains (Losses) Included in AOCL	Pension Benefits			Other Postretirement Benefits			Pension Benefits			Other Postretirement Benefits
Beginning balance	$	(58,584	)	$	(7,881	)	$	(97,226	)	$	(6,597	)
Net actuarial gain (loss)	—			—			(5,558		)	267
Amortization of prior service credit	(91		)	—			(91		)	—
Amortization of actuarial loss	2,811			400			6,523			294
Settlement cost	1,726			—			—			—
Ending balance	$	(54,138	)	$	(7,481	)	$	(96,352	)	$	(6,036	)