Postretirement Benefit Plans (Tables)

6 Months Ended

Jun. 30, 2011

Postretirement Benefit Plans (Tables) [Abstract]

Components of the Net periodic benefit cost

	For the Three Months Ended June 30,
	Retirement Plans						Other Benefits
	2011			2010			2011			2010
				(In thousands)
Service cost	$	1,123		$	1,018		$	250		$	152
Interest cost		2,190			2,076			646			476
Expected return on assets		(3,080	)		(2,914	)		—			—
Amortization of:
Net loss		945			680			332			66
Unrecognized prior service cost		87			85			(391	)		(391	)
Net periodic benefit cost	$	1,265		$	945		$	837		$	303

	For the Six Months Ended June 30,
	Retirement Plans						Other Benefits
	2011			2010			2011			2010
				(In thousands)
Service cost	$	2,246		$	2,036		$	501		$	304
Interest cost		4,380			4,152			1,292			952
Expected return on assets		(6,160	)		(5,828	)		—			—
Amortization of:
Net loss		1,890			1,360			664			132
Unrecognized prior service cost		174			170			(783	)		(782	)
Net periodic benefit cost	$	2,530		$	1,890		$	1,675		$	606