Employee Benefit Plans (Tables)

9 Months Ended

Sep. 30, 2016

Compensation and Retirement Disclosure [Abstract]

Schedule Of Consolidated Net Periodic Benefit Costs

The following tables present our consolidated net periodic benefit costs related to the pension and postretirement benefit plans for the three and nine months ended September 30, 2015 and 2016 (in thousands):

	Three Months Ended						Three Months Ended
	September 30, 2015						September 30, 2016
	Pension Benefits			Other  Postretirement Benefits			Pension Benefits			Other  Postretirement Benefits
Components of net periodic benefit costs:
Service cost	$	4,723		$	61		$	4,555		$	53
Interest cost	1,938			109			1,992			148
Expected return on plan assets	(2,009		)	—			(2,235		)	—
Amortization of prior service credit	—			(928		)	(45		)	(928		)
Amortization of actuarial loss	1,577			221			1,161			291
Settlement cost	—			—			202			—
Net periodic benefit cost (credit)	$	6,229		$	(537	)	$	5,630		$	(436	)

	Nine Months Ended						Nine Months Ended
	September 30, 2015						September 30, 2016
	Pension Benefits			Other  Postretirement Benefits			Pension Benefits			Other  Postretirement Benefits
Components of net periodic benefit costs:
Service cost	$	14,168		$	183		$	13,648		$	176
Interest cost	5,815			328			5,970			368
Expected return on plan assets	(6,028		)	—			(6,694		)	—
Amortization of prior service credit	—			(2,784		)	(135		)	(2,785		)
Amortization of actuarial loss	4,730			663			3,485			660
Settlement cost	—			—			202			—
Net periodic benefit cost (credit)	$	18,685		$	(1,610	)	$	16,476		$	(1,581	)

Schedule of Amounts Recognized in Other Comprehensive Income (Loss)

The changes in AOCL related to employee benefit plan assets and benefit obligations for the three and nine months ended September 30, 2015 and 2016 were as follows (in thousands):

	Three Months Ended						Three Months Ended
	September 30, 2015						September 30, 2016
Gains (Losses) Included in AOCL	Pension Benefits			Other Postretirement Benefits			Pension Benefits			Other Postretirement Benefits
Beginning balance	$	(60,104	)	$	(3,110	)	$	(60,045	)	$	(5,433	)
Amortization of prior service credit	—			(928		)	(45		)	(928		)
Amortization of actuarial loss	1,577			221			1,161			291
Settlement cost	—			—			202			—
Ending balance	$	(58,527	)	$	(3,817	)	$	(58,727	)	$	(6,070	)

	Nine Months Ended						Nine Months Ended
	September 30, 2015						September 30, 2016
Gains (Losses) Included in AOCL	Pension Benefits			Other Postretirement Benefits			Pension Benefits			Other Postretirement Benefits
Beginning balance	$	(63,257	)	$	(1,696	)	$	(62,279	)	$	(3,945	)
Amortization of prior service credit	—			(2,784		)	(135		)	(2,785		)
Amortization of actuarial loss	4,730			663			3,485			660
Settlement cost	—			—			202			—
Ending balance	$	(58,527	)	$	(3,817	)	$	(58,727	)	$	(6,070	)