Postretirement Benefit Plans (Tables)

3 Months Ended

Mar. 31, 2012

Postretirement Benefit Plans (Tables) [Abstract]

Components of the Net periodic benefit cost

The components of the net periodic expense for the plans were as follows:

	For the Three Months Ended March 31,
	Retirement Plans						Other Benefits
	2012			2011			2012			2011
	(In thousands)
Service cost	$	1,298		$	1,123		$	307		$	250
Interest cost		2,149			2,190			573			646
Expected return on assets		(3,007	)		(3,080	)		—			—
Amortization of:
Net loss		1,382			945			306			332
Unrecognized prior service cost		90			87			(391	)		(391	)
Net periodic benefit cost	$	1,912		$	1,265		$	795		$	837