Accounting Policies - EPS (Details 11) - shares shares in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Accounting Policies [Abstract]
Weighted average common shares outstanding - basic	200,522	200,522	200,522	200,440	200,383	199,343	198,270	196,401	200,502	198,612	195,720
Effect of dilutive performance share awards									69	14	430
Weighted average common shares outstanding - diluted	200,923	200,619	200,539	200,456	200,478	199,383	198,287	196,414	200,571	198,626	196,150
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount									164	164	10