Employee Benefit Plans (Tables) (Defined Benefit Pension [Member])

3 Months Ended

Mar. 31, 2012

Defined Benefit Pension [Member]

Defined Benefit Plan Disclosure [Line Items]

Schedule of Net Benefit Costs

For the three-month periods ended March 31, 2012 and 2011 the components of pension expense are as follows:

	Three Months Ended March 31
	2012			2011
Service cost	$	2,827		$	2,571
Interest cost	4,496			4,507
Expected return on assets	(5,379		)	(5,535		)
Amortization of prior service cost	53			39
Amortization of net actuarial loss	2,737			1,213
Total pension expense	$	4,734		$	2,795