Stockholder's Equity (Cash Dividends Paid Or Payable Per Share) (Details) - $ / shares	3 Months Ended
	Jun. 30, 2017	Mar. 31, 2017
Common Stock [Member]
Dividends Payable [Line Items]
Dividend per Share, Common stock	$ 0.200000	$ 0.200000
Declaration Date	May 02, 2017	Feb. 07, 2017
Record Date	Jul. 07, 2017	Mar. 28, 2017
Date Paid	Jul. 21, 2017	Apr. 12, 2017
Preferred Stock [Member]
Dividends Payable [Line Items]
Dividend per Share, Preferred stock	$ 0.484375	$ 0.484375
Declaration Date	May 02, 2017	Feb. 07, 2017
Record Date	Jun. 09, 2017	Mar. 10, 2017
Date Paid	Jun. 30, 2017	Mar. 31, 2017