Employee Benefit Plans (Tables)

3 Months Ended

Mar. 31, 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 months ended March 31, 2015 and 2016 (in thousands):

	Three Months Ended						Three Months Ended
	March 31, 2015						March 31, 2016
	Pension Benefits			Other  Postretirement Benefits			Pension Benefits			Other  Postretirement Benefits
Components of net periodic benefit costs:
Service cost	$	4,470		$	66		$	4,688		$	61
Interest cost	1,869			110			2,045			110
Expected return on plan assets	(1,896		)	—			(2,128		)	—
Amortization of prior service credit	—			(928		)	(45		)	(928		)
Amortization of actuarial loss	1,347			225			1,217			184
Net periodic benefit cost (credit)	$	5,790		$	(527	)	$	5,777		$	(573	)

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 months ended March 31, 2015 and 2016 were as follows (in thousands):

	Three Months Ended						Three Months Ended
	March 31, 2015						March 31, 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	—			(928		)	(45		)	(928		)
Amortization of actuarial loss	1,347			225			1,217			184
Ending balance	$	(61,910	)	$	(2,399	)	$	(61,107	)	$	(4,689	)