Earnings Per Share (Narrative) (Details) - shares	1 Months Ended	3 Months Ended	9 Months Ended
	Jan. 31, 2015	Mar. 31, 2018	Sep. 30, 2017	Jan. 12, 2018
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Preferred stock, date dividend declared		Dec. 18, 2017
Preferred stock, date dividend to be paid		Jan. 16, 2018
Preferred stock, common shares issued as stock dividend			10,040,306
Common Stock [Member]
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Shares issued upon conversion				74,998,614
Depositary Shares [Member]
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Shares issued	34,500,000