Employee Benefit Plans (Tables) (Defined Benefit Pension)

3 Months Ended

Mar. 31, 2013

Defined Benefit Pension

Defined Benefit Plan Disclosure [Line Items]

Schedule of Net Benefit Costs

For the three-month periods ended March 31, 2013, and 2012 the components of pension expense are as follows:

	Three months ended March 31
	2013			2012
Service cost	$	4,222		$	2,827
Interest cost	5,895			4,496
Expected return on assets	(6,931		)	(5,379		)
Amortization of prior service cost	53			53
Amortization of net actuarial loss	4,251			2,737
Total pension expense	$	7,490		$	4,734