Statements of Condensed Consolidated Equity (Unaudited) (Parenthetical) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Statement of Stockholders' Equity [Abstract]
Other post-retirement benefits liability adjustments, tax		$ 10		$ 20
Other post-retirement benefits liability adjustments, tax	$ 24	$ 26	$ 48	$ 52
Dividends declared per common share (in dollars per share)		$ 0.03	$ 0.03	$ 0.06
Common stock, authorized shares (in shares)	320,000,000		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