XML 60 R50.htm IDEA: XBRL DOCUMENT v3.7.0.1
Pension And Postretirement Benefit Plans (Details)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2017
USD ($)
Jun. 30, 2016
USD ($)
Jun. 30, 2017
USD ($)
employee
Jun. 30, 2016
USD ($)
Defined Benefit Plan Disclosure [Line Items]        
Retired employees receiving health care and life insurance benefits | employee     9  
Post retirement benefits, age eligibility requirement     65 years  
Post retirement benefits, service eligibility requirement     15 years  
Postretirement Benefits [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Net periodic benefit cost | $ $ (1) $ 0 $ (2) $ (1)