Employee Benefits Plan (Details 2) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
SERP Plan
     
Net actuarial loss (gain) $ 3,789 $ 7,003 $ 6,063
Prior service cost (credit) 760 926 1,092
Unrecognized net initial obligation 0 0 0
Total 4,549 7,929 7,155
Life and Healthcare Plan
     
Net actuarial loss (gain) 1,183 2,448 1,878
Prior service cost (credit) 281 297 312
Unrecognized net initial obligation 0 50 117
Total 1,464 2,795 2,307
Pension Plan
     
Net actuarial loss (gain) 22,269 37,182 35,955
Prior service cost (credit) (347) (470) (593)
Unrecognized net initial obligation 0 0 0
Total $ 21,922 $ 36,712 $ 35,362