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Retirement Plans
6 Months Ended
Jun. 30, 2012
Retirement Plans [Abstract]  
Retirement Plans
5.  
Retirement Plans

The Company's components of annual benefit cost for the defined benefit plans for the periods presented are as follows:
 
Three Months Ended June 30,
 
 
Six Months Ended
June 30,
 
(In thousands)
 
2012
 
 
2011
 
 
2012
 
 
2011
 
 
 
 
 
 
 
 
 
 
 
 
 
Service cost
 
$
635
 
 
$
606
 
 
$
1,271
 
 
$
1,213
 
Interest cost
 
 
675
 
 
 
727
 
 
 
1,352
 
 
 
1,453
 
Expected return on plan assets
 
 
(358
)
 
 
(370
)
 
 
(717
)
 
 
(740
)
Amortization of prior service cost
 
 
493
 
 
 
811
 
 
 
986
 
 
 
1,623
 
Amortization of actuarial loss
 
 
188
 
 
 
336
 
 
 
377
 
 
 
672
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Defined benefit expense
 
$
1,633
 
 
$
2,110
 
 
$
3,269
 
 
$
4,221