Defined Benefit Plans (Tables)

9 Months Ended

Sep. 30, 2013

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, 2013 and 2012 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,
	2013			2012			2013			2012			2013			2012			2013			2012
	(dollars in thousands)
Service costs	$	170		$	150		$	520		$	450		$	—		$	—		$	—		$	—
Interest costs	410			410			1,230			1,210			10			20			30			40
Expected return on plan assets	(460		)	(430		)	(1,380		)	(1,280		)	—			—			—			—
Amortization of prior service cost	—			—			10			10			—			(70		)	—			(200		)
Settlement/curtailment (gain)	—			—			—			—			—			(1,490		)	—			(1,490		)
Amortization of net (gain)/loss	320			260			960			790			(20		)	(20		)	(60		)	(60		)
Net periodic benefit cost	$	440		$	390		$	1,340		$	1,180		$	(10	)	$	(1,560	)	$	(30	)	$	(1,710	)