Severance Costs (Tables)

3 Months Ended

Mar. 31, 2012

Severance Costs [Abstract]

Schedule Of Aggregate Net Severance Charges

	Three months ended March  31,
	2012				2011
Accrued severance charges, beginning of period		$	3,518			$	5,441
Payments for period			(547	)			(494)
Interest accretion			54				78
Accrued severance charges, end of period		$	3,025			$	5,025