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

9 Months Ended

Sep. 30, 2011

Defined Benefit Pension [Member]

Defined Benefit Plan Disclosure [Line Items]

Schedule of Net Benefit Costs

	Three Months Ended September 30						Nine months ended September 30,
	2011			2010			2011			2010
Service cost	$	3,316		$	2,760		$	9,949		$	9,431
Interest cost	5,953			5,192			17,858			17,738
Expected return on assets	(7,178		)	(6,533		)	(21,530		)	(22,551		)
Amortization of prior service cost	53			42			158			157
Amortization of net actuarial loss	1,596			771			4,786			2,851
Total pension expense	$	3,740		$	2,232		$	11,221		$	7,626