XML 17 R37.htm IDEA: XBRL DOCUMENT v3.3.0.814
Defined Benefit Postretirement Plans (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Pension Benefits [Member]        
Components of net periodic (benefit) cost [Abstract]        
Service cost $ 669 $ 587 $ 1,979 $ 1,761
Interest cost 996 1,040 2,992 3,120
Expected return on plan assets (2,147) (2,175) (6,447) (6,525)
Net amortization 550 25 1,642 75
Total cost (benefit) 68 (523) 166 (1,569)
Other Benefits [Member]        
Components of net periodic (benefit) cost [Abstract]        
Service cost 4 4 12 12
Interest cost 101 90 283 270
Expected return on plan assets 0 0 0 0
Net amortization 1 (6) 31 (18)
Total cost (benefit) $ 106 $ 88 $ 326 $ 264