Pensions (Tables)

3 Months Ended

Mar. 31, 2013

Compensation and Retirement Disclosure [Abstract]

Schedule of Net Benefit Costs

Components of Net Periodic Pension Cost
	Three Months Ended March 31
	2013			2012
Service cost	$	297		$	263
Interest cost		320			322
Expected return on plan assets		(411	)		(360	)
Amortization of actuarial loss		174			160
Amortization of prior service cost		3			4
Rate-regulated adjustment		15			9
Net periodic pension expense	$	398		$	398