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Pensions and Other Postretirement Benefit Plans (Tables)
9 Months Ended
Sep. 30, 2015
Pensions and Other Postretirement Benefit Plans [Abstract]  
Schedule of Net Periodic Benefit Plan Cost
    Pension plans   Other postretirement benefits
(in thousands)   2015   2014   2015   2014
Components of net periodic benefit cost:                
Service cost   $ 2,268     $ 2,521   $ 250
  $ 236
Interest cost     5,779       7,217     1,831       2,057
Expected return on assets     (6,418 )     (7,260 )     -       -
Amortization of prior service cost/(credit)     36       41     (3,366 )     (3,366 )
Amortization of net actuarial loss     1,924       1,845     2,504       2,181
Curtailment gain     -
    (710 )     -       -  
Net periodic benefit cost   $ $3,589     $ 3,654     $ 1,219     $ 1,108