Benefit Plans

9 Months Ended

Sep. 30, 2013

Compensation and Retirement Disclosure [Abstract]

Benefit Plans

Benefit Plans

The components of our consolidated net pension costs are set forth in the following table:

	For the Three Months Ended						For the Nine Months Ended
	September 30,						September 30,
	2012			2013			2012			2013
	(Dollars in thousands)						(Dollars in thousands)
Service cost	$	426		$	489		$	1,278		$	1,467
Interest cost	2,150			1,985			6,450			5,955
Expected return on plan assets	(2,195		)	(1,706		)	(6,585		)	(5,118		)
Amortization of prior service cost	6			6			18			18
Net cost	$	387		$	774		$	1,161		$	2,322

The components of our consolidated net postretirement costs are set forth in the following table: 

	For the Three Months Ended						For the Nine Months Ended
	September 30,						September 30,
	2012			2013			2012			2013
	(Dollars in thousands)						(Dollars in thousands)
Service cost	$	46		$	28		$	138		$	84
Interest cost	381			331			1,143			993
Amortization of prior service benefit	(49		)	(50		)	(147		)	(150		)
Plan amendment	—			—			1,147			—
Net cost	$	378		$	309		$	2,281		$	927