Defined Benefit Plans (Tables)

9 Months Ended

Sep. 30, 2016

Defined Benefit Pension Plans and Defined Benefit Postretirement Plans Disclosure [Abstract]

Schedule of Costs of Retirement Plans

The components of net periodic pension and postretirement benefit costs for the three and nine months ended September 30, 2016 and 2015 are as follows (dollars in thousands):

	Pension Plans												Other Postretirement Benefits
	Three months ended September 30,						Nine months ended September 30,						Three months ended September 30,						Nine months ended September 30,
	2016			2015			2016			2015			2016			2015			2016			2015
Service costs	$	250		$	210		$	740		$	680		$	—		$	—		$	—		$	—
Interest costs	390			380			1,180			1,210			—			10			10			20
Expected return on plan assets	(420		)	(420		)	(1,260		)	(1,430		)	—			—			—			—
Amortization of prior service cost	—			—			10			10			—			—			—			—
Settlement/curtailment loss	—			—			—			2,750			—			—			—			—
Amortization of net (gain)/loss	230			310			700			1,050			(10		)	(10		)	(40		)	(30		)
Net periodic benefit cost	$	450		$	480		$	1,370		$	4,270		$	(10	)	$	—		$	(30	)	$	(10	)