XML 14 R4.htm IDEA: XBRL DOCUMENT v3.5.0.2
Statements of Consolidated Comprehensive (Loss) Income (Unaudited) (Parenthetical) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Statement of Comprehensive Income [Abstract]        
Natural gas, tax benefit $ (10,701) $ (28,211) $ (19,040) $ (55,211)
Interest rate, tax expense 27 25 52 50
Pension and other post-retirement benefits liability adjustment, tax expense $ 6,100 $ 128 $ 6,235 $ 255