Annual report pursuant to Section 13 and 15(d)

Postretirement Benefits, Schedule of Amounts Recognized in Balance Sheet (Details)

v3.6.0.2
Postretirement Benefits, Schedule of Amounts Recognized in Balance Sheet (Details) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Amounts recognized in the consolidated balance sheets:    
Pension benefit liability $ (47,146) $ (42,001)