Pension Plans and Other Postretirement Benefits (Tables)

6 Months Ended

Jun. 30, 2011

Pension Plans and Other Postretirement Benefits [Abstract]

Components of Net Periodic Benefit Costs

					Pension Benefits
		Six Months Ended						Three Months Ended
		June 30,							June 30,
		2011			2010				2011			2010
Service cost	$	2,087		$	2,344		$	1,044			$	1,172
Interest cost		5,928			6,440				2,964			3,220
Expected return on plan assets		(5,191	)		(5,592	)			(2,596	)		(2,796	)
Amortization of prior service cost		87			70				43			35
Amortization of actuarial loss		2,033			2,060				1,016			1,030
Capitalized costs		(1,808	)		(1,685	)			(951	)		(888	)
Settlement charge		-			884				-			884
Net periodic benefit cost	$	3,136		$	4,521		$	1,520			$	2,657
					Other
					Postretirement Benefits
		Six Months Ended						Three Months Ended
		June 30,							June 30,
		2011			2010				2011			2010
Service cost	$	751		$	610			$	376		$	305
Interest cost		1,623			1,240				812			620
Expected return on plan assets		(1,243	)		(924	)			(621	)		(462	)
Amortization of transition obligation		69			52				34			26
Amortization of prior service cost		(178	)		(134	)			(89	)		(67	)
Amortization of actuarial loss		411			342				206			171
Amortization of regulatory asset		68			68				34			34
Capitalized costs		(343	)		(250	)			(188	)		(129	)
Net periodic benefit cost	$	1,158		$	1,004			$	564		$	498