Benefit Plans (Tables)

9 Months Ended

Sep. 30, 2017

Benefit Plans

Schedule of components of net periodic benefit cost

	Pension Benefits				Other Benefits
(dollars inthousands)	2017		2016		2017		2016
Three Months Ended September 30,
Service cost	$	157	$	215	$	179	$	193
Interest cost		2,041		2,172		201		210
Expected return on plan assets		(1,242)		(1,180)		—		—
Prior service credit		—		—		(107)		(107)
Recognized net actuarial loss		2,000		1,774		—		—
Total net periodic benefit cost	$	2,956	$	2,981	$	273	$	296
Nine Months Ended September 30,
Service cost	$	472	$	644	$	537	$	577
Interest cost		6,124		6,486		603		631
Expected return on plan assets		(3,726)		(3,515)		—		—
Prior service credit		—		—		(322)		(321)
Recognized net actuarial loss		5,998		5,319		—		—
Total net periodic benefit cost	$	8,868	$	8,934	$	818	$	887