Pension and Postretirement Benefits (Tables)

9 Months Ended

Sep. 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 September 30,
	Pension						Postretirement Benefits
	2014			2013			2014			2013
	(Dollars in Thousands)
Service cost	$	4,996		$	4,030		$	57		$	57
Interest cost		7,979			5,756			302			253
Expected return on assets		(8,627	)		(6,668	)		—			—
Amortization of:
Prior service cost (credit)		111			112			(814	)		(814	)
Actuarial loss (gain)		1,011			3,920			(66	)		6
Settlement charge		—			729			—			—
Termination benefit cost		13,680			—			—			—
Net periodic benefit cost (credit)	$	19,150		$	7,879		$	(521	)	$	(498	)

	Nine Months Ended September 30,
	Pension						Postretirement Benefits
	2014			2013			2014			2013
	(Dollars in Thousands)
Service cost	$	12,129		$	12,091		$	150		$	170
Interest cost		20,952			17,268			861			760
Expected return on assets		(24,030	)		(20,003	)		—			—
Amortization of:
Prior service cost (credit)		334			337			(2,441	)		(2,441	)
Actuarial loss (gain)		3,034			11,760			(199	)		19
Settlement charge		—			729			—			—
Termination benefit cost		13,680			—			—			—
Net periodic benefit cost (credit)	$	26,099		$	22,182		$	(1,629	)	$	(1,492	)