Pension Plan (Tables)

9 Months Ended

Sep. 30, 2012

Pension Plan [Abstract]

Components of net periodic pension cost

	Three months ended September 30,						Nine months ended September 30,
	2012			2011			2012			2011
Service cost	$	286		$	290		$	858		$	871
Interest cost		1,165			1,262			3,495			3,785
Expected return on assets		(1,825	)		(1,642	)		(5,476	)		(4,925	)
Recognized actuarial loss		1,055			607			3,165			1,821
Net periodic pension cost	$	681		$	517		$	2,042		$	1,552