Pension and Post-Retirement Health Care Benefit Plans (Tables)

6 Months Ended

Jun. 30, 2011

Pension Benefits [Member]

Summary of Net Periodic Benefit Cost

	Pension Benefits
	For the Three Months Ended June 30,						For the Six Months Ended June 30,
	2011			2010			2011			2010
Service cost - benefit earned during the period	$	193		$	217		$	385		$	434
Interest cost on projected benefit obligation		2,120			2,055			4,240			4,110
Expected return on plan assets		(2,338	)		(2,159	)		(4,860	)		(4,318	)
Amortization of prior service cost		34			34			68			68
Amortization of actuarial loss		485			475			970			951
Net periodic pension cost	$	494		$	622		$	803		$	1,245

Postretirement Healthcare [Member]

Summary of Net Periodic Benefit Cost

	Post-retirement Healthcare
	For the Three Months Ended June 30, 2010			For the Six Months Ended June 30, 2010
Service cost - benefit earned during the period	$	58		$	116
Interest cost on projected benefit obligation		65			130
Amortization of actuarial gain		(85	)		(170	)
Net periodic post-retirement healthcare benefit cost	$	38		$	76