Defined Benefit Pension Plan (Tables)

6 Months Ended

Jun. 30, 2011

Defined Benefit Pension Plan

Pension Benefit Plan

	Three Months Ended June 30,						Six Months Ended June 30,
	2011			2010			2011			2010
Service cost	$	1,011		$	929		$	2,013		$	1,902
Interest cost		3,441			3,351			6,850			6,859
Expected return on plan assets		(5,857	)		(5,175	)		(11,660	)		(10,593	)
Amortization of prior service cost		—			3			—			6
Net pension benefit	$	(1,405	)	$	(892	)	$	(2,797	)	$	(1,826	)