Statements of Condensed Consolidated Equity (Unaudited) (Parenthetical) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Statement of Stockholders' Equity [Abstract]
Other post-retirement benefits liability adjustments, tax		$ 10		$ 30
Other post-retirement benefits liability adjustments, tax	$ 23	$ 26	$ 71	$ 78
Dividends declared per common share (in dollars per share)		$ 0.03	$ 0.03	$ 0.09
Common stock, authorized shares (in shares)	640,000,000	320,000,000	640,000,000	320,000,000
Preferred stock authorized (in shares)	3,000,000		3,000,000
Preferred stock issued (in shares)	0		0
Preferred stock outstanding (in shares)	0		0
Accounting Standards Update [Extensible List]			us-gaap:AccountingStandardsUpdate201802Member	us-gaap:AccountingStandardsUpdate201802Member