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Pension Benefits (Net Periodic Pension Cost) (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Net periodic pension cost        
Service cost $ 453 $ 373 $ 906 $ 746
Interest cost 291 299 582 598
Expected return on plan assets (440) (406) (880) (812)
Amortization of prior year service cost (5) [1] (5) (10) [1] (10)
Amortization of transition asset (2) [1] (4) (4) [1] (8)
Recognized net actuarial loss 341 262 682 524
Net periodic pension cost $ 638 $ 519 $ 1,276 $ 1,038
[1] These accumulated other comprehensive loss components are included in the computation of net periodic benefit cost (see Note 16 for additional details).