Income Taxes and Distributions (Cash Distributions Paid to Common Stockholders) (Details) - $ / shares	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Per Share
Ordinary dividend	$ 2.1988	$ 1.8117	$ 2.5067
Long-term capital gain/(loss)	1.1153	1.5755	0.8760
Return of capital	0.1659	0.0928	0.0573
Totals	3.4800	3.4800	3.4400
Section 199A dividend included in Ordinary dividend	2.1988
Qualified Dividend		0.0038	0.0047
Gains 1250 per share	$ 0.3822	$ 0.3557	$ 0.4120