Summary of Significant Accounting Policies - (Tables)

12 Months Ended

Dec. 31, 2017

Accounting Policies [Abstract]

Schedule of dividends declared

Dividends and distributions for the years ended December 31, 2017, 2016, and 2015 are as follows:

Declaration Date	Record Date	Payment Date	Cash Dividend per Share/Unit
December 21, 2017	January 3, 2018	January 18, 2018	$	0.230
September 21, 2017	October 3, 2017	October 18, 2017	$	0.230
June 12, 2017	July 3, 2017	July 18, 2017	$	0.230
March 17, 2017	April 5, 2017	April 18, 2017	$	0.225
December 22, 2016	January 5, 2017	January 18, 2017	$	0.225
September 26, 2016	October 6, 2016	October 18, 2016	$	0.225
June 23, 2016	July 5, 2016	July 18, 2016	$	0.225
March 18, 2016	April 1, 2016	April 18, 2016	$	0.225
December 31, 2015	January 15, 2016	January 29, 2016	$	0.225
September 28, 2015	October 16, 2015	October 30, 2015	$	0.225
July 1, 2015	July 17, 2015	July 31, 2015	$	0.225
April 6, 2015	April 17, 2015	May 1, 2015	$	0.225

Dividends and distributions per share

The following table sets forth the federal income tax status of distributions per common share and OP Unit for the periods presented:

	Year Ended December 31,
	2017		2016		2015
Per common share and OP Unit:
Ordinary dividends	$	0.4529	$	0.5325	$	0.2693
Qualified dividends	—		—		—
Capital gain distributions	—		—		—
Non-dividend distributions	0.4571		0.3675		0.6307
Total	$	0.9100	$	0.9000	$	0.9000