Defined Benefit Plans (Tables)

3 Months Ended

Mar. 31, 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 months ended March 31, 2016 and 2015 are as follows:

	Pension Plans						Other Postretirement Benefits
	Three months ended March 31,						Three months ended March 31,
	2016			2015			2016			2015
	(dollars in thousands)
Service costs	$	250		$	240		$	—		$	—
Interest costs	400			420			—			10
Expected return on plan assets	(420		)	(520		)	—			—
Amortization of net (gain)/loss	230			380			(10		)	(10		)
Net periodic benefit cost	$	460		$	520		$	(10	)	$	—