XML 83 R72.htm IDEA: XBRL DOCUMENT v3.10.0.1
Benefit Plans - Components of Net Periodic Benefit Cost (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Dec. 31, 2017
Components of Net Periodic Benefit Cost          
Service cost $ 300 $ 250 $ 900 $ 751 $ 1,001
Interest cost 310 307 931 921 $ 1,228
Net loss 133 73 399 218  
Net periodic pension cost $ 743 $ 630 $ 2,230 $ 1,890