XML 112 R98.htm IDEA: XBRL DOCUMENT v3.8.0.1
Retirement Plans, Estimated Future Benefit Payments (Details)
$ in Thousands
Dec. 31, 2017
USD ($)
Retirement Account Plan  
Defined Benefit Plan Disclosure [Line Items]  
2018 $ 14,697
2019 14,436
2020 15,096
2021 15,278
2022 16,020
2023 - 2027 71,781
Postretirement Plan  
Defined Benefit Plan Disclosure [Line Items]  
2018 237
2019 197
2020 194
2021 190
2022 186
2023 - 2027 $ 839