Employee Benefit Plans (Tables)

6 Months Ended

Jun. 30, 2012

Employee Benefit Plans [Abstract]

Schedule Of Consolidated Net Periodic Benefit Costs

		Three Months Ended						Three Months Ended
		June 30, 2011						June 30, 2012
					Other Post-						Other Post-
		Pension			Retirement			Pension			Retirement
		Benefits			Benefits			Benefits			Benefits
Components of net periodic benefit costs:
Service cost	$	1,985		$	91		$	3,190		$	137
Interest cost		950			260			1,204			258
Expected return on plan assets		(1,022	)		—			(1,176	)		—
Amortization of prior service cost (credit)		77			(213	)		77			(211	)
Amortization of actuarial loss		151			62			826			161
Net periodic benefit cost	$	2,141		$	200		$	4,121		$	345

		Six Months Ended						Six Months Ended
		June 30, 2011						June 30, 2012
					Other Post-						Other Post-
		Pension			Retirement			Pension			Retirement
		Benefits			Benefits			Benefits			Benefits
Components of net periodic benefit costs:
Service cost	$	3,970		$	182		$	6,380		$	275
Interest cost		1,899			519			2,407			515
Expected return on plan assets		(2,043	)		—			(2,352	)		—
Amortization of prior service cost (credit)		154			(426	)		154			(424	)
Amortization of actuarial loss		302			125			1,653			322
Net periodic benefit cost	$	4,282		$	400		$	8,242		$	688