Pension and Postretirement Benefits (Tables)

6 Months Ended

Jun. 30, 2014

Schedule of Components of Net Periodic Benefit Cost

The estimated components of the recorded net periodic benefit cost (credit) for pension and postretirement benefits are as follows:

	Three Months Ended June 30,
	Pension						Postretirement Benefits
	2014			2013			2014			2013
	(Dollars in Thousands)
Service cost	$	3,092		$	4,060		$	51		$	56
Interest cost		5,624			5,799			305			251
Expected return on assets		(6,677	)		(6,717	)		—			—
Amortization of:
Prior service cost (credit)		96			113			(887	)		(808	)
Actuarial loss (gain)		877			3,949			(73	)		6
Net periodic benefit cost (credit)	$	3,012		$	7,204		$	(604	)	$	(495	)
	Six Months Ended June 30,
	Pension						Postretirement Benefits
	2014			2013			2014			2013
	(Dollars in Thousands)
Service cost	$	7,131		$	8,060		$	93		$	113
Interest cost		12,971			11,512			559			506
Expected return on assets		(15,400	)		(13,335	)		—			—
Amortization of:
Prior service cost (credit)		223			224			(1,627	)		(1,627	)
Actuarial loss (gain)		2,022			7,840			(133	)		12
Net periodic benefit cost (credit)	$	6,947		$	14,301		$	(1,108	)	$	(996	)