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Pension Plans (Tables)
6 Months Ended
Jun. 30, 2013
Pension Plans [Abstract]  
Net Pension Costs
Net pension costs included the following components (in thousands):

Three Months Ended
June 30,
Six Months Ended
June 30,
2013
2012
2013
2012
Service cost-benefits earned during period
$27$31$54$62
Interest cost on projected benefit obligations
8779431,7541,886
Expected return on plan assets
(1,243 )(1,118 )(2,486 )(2,236 )
Amortization of prior service costs
5252104104
Amortization of actuarial loss
428490856980
Net pension costs
$141$398$282$796