Pension, Savings, and Other Employee Benefits (Tables)

9 Months Ended

Sep. 30, 2018

Retirement Benefits [Abstract]

Schedule of Components of Net Periodic Benefit Cost

The amounts reclassified are presented in the table below.

	Three Months Ended September 30, 2017		Nine Months Ended September 30, 2017		Fiscal Years Ended December 31
(Dollars in thousands)					2017		2016			2015
Net periodic benefit cost reclassified	$	415	$	1,665	$	1,946	$	(843	)	$	(1,168	)

The components of net periodic benefit cost for the three months ended September 30 are as follows:

	Pension Benefits						Other Benefits
(Dollars in thousands)	2018			2017			2018			2017
Components of net periodic benefit cost
Service cost	$	11		$	9		$	33		$	26
Interest cost	6,935			7,276			328			328
Expected return on plan assets	(8,222		)	(9,230		)	(268		)	(236		)
Amortization of unrecognized:
Prior service cost/(credit)	—			13			—			23
Actuarial (gain)/loss	3,164			2,380			(108		)	(140		)
Net periodic benefit cost/(credit)	$	1,888		$	448		$	(15	)	$	1

The components of net periodic benefit cost for the nine months ended September 30 are as follows:

	Pension Benefits						Other Benefits
(Dollars in thousands)	2018			2017			2018			2017
Components of net periodic benefit cost
Service cost	$	31		$	28		$	100		$	80
Interest cost	20,908			22,035			982			979
Expected return on plan assets	(24,673		)	(27,011		)	(806		)	(710		)
Amortization of unrecognized:
Prior service cost/(credit)	—			39			—			71
Actuarial (gain)/loss	9,076			7,140			(290		)	(425		)
Net periodic benefit cost/(credit)	$	5,342		$	2,231		$	(14	)	$	(5	)