Employee Retirement Plans (Tables)

9 Months Ended

Sep. 30, 2013

Pension cost

Employee retirement plans

Schedule of components of net periodic other postretirement benefit cost

	Three months ended						Nine months ended
	September 30, 2013			September 30, 2012			September 30, 2013			September 30, 2012
Component of net periodic pension cost:
Service cost	$	62		$	67		$	185		$	201
Interest cost	362			370			1,087			1,110
Expected return on plan assets	(352		)	(318		)	(1,057		)	(954		)
Amortization of net loss	302			192			905			576
Net periodic pension cost	$	374		$	311		$	1,120		$	933

Other postretirement benefit cost

Employee retirement plans

Schedule of components of net periodic other postretirement benefit cost

	Three months ended						Nine months ended
	September 30, 2013			September 30, 2012			September 30, 2013			September 30, 2012
Components of net periodic other postretirement benefit cost
Service cost	$	63		$	70		$	188		$	210
Interest cost	61			90			184			270
Amortization of net gain	(43		)	(4		)	(129		)	(12		)
Net periodic other postretirement benefit cost	$	81		$	156		$	243		$	468