Defined Benefit Plans (Tables)

9 Months Ended

Sep. 30, 2012

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, 2012 and 2011 are as follows:

	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,
	2012			2011			2012			2011			2012			2011			2012			2011
	(dollars in thousands)
Service costs	$	150		$	160		$	450		$	480		$	—		$	—		$	—		$	—
Interest costs	410			400			1,210			1,200			20			10			40			30
Expected return on plan assets	(430		)	(400		)	(1,280		)	(1,210		)	—			—			—			—
Amortization of prior service cost	—			—			10			10			(70		)	(70		)	(200		)	(200		)
Settlement/curtailment (gain)	—			—			—			—			(1,490		)	—			(1,490		)	—
Amortization of net (gain)/loss	260			180			790			530			(20		)	(20		)	(60		)	(60		)
Net periodic benefit cost	$	390		$	340		$	1,180		$	1,010		$	(1,560	)	$	(80	)	$	(1,710	)	$	(230	)