Common Stock and Other Equity Related Transactions (Tables)

12 Months Ended

Dec. 31, 2017

Equity [Abstract]

Schedule of Common Stock Outstanding Roll Forward

The following table presents the changes in our outstanding common stock for the years ended December 31, 2017, 2016 and 2015 (excluding OP Units of 5,834,100, 7,170,000, and 7,207,678 outstanding at December 31, 2017, 2016 and 2015, respectively):

	Years Ended December 31,
	2017		2016		2015
Shares outstanding at January 1,	85,529,386		84,253,065		83,879,779
Common stock issued through the ATM Equity Offering Program	1,380,017		683,548		—
Common stock issued through conversion of OP Units	1,335,900		37,678		24,289
Common stock issued through exercise of options	220,000		440,000		220,000
Common stock issued through stock grants	130,426		133,717		158,014
Common stock forfeitures	(990	)	—		—
Common stock issued through ESPP and Dividend Reinvestment Plan	25,101		17,373		20,133
Common stock repurchased and retired	(34,680	)	(35,995	)	(49,150	)
Shares outstanding at December 31,	88,585,160		85,529,386		84,253,065

Dividends Declared

The following regular quarterly distributions have been declared and paid to common stockholders and common OP Unit non-controlling interests since January 1, 2015:

Distribution Amount Per Share	For the Quarter Ended	Stockholder Record Date	Payment Date
$0.375000	March 31, 2015	March 27, 2015	April 10, 2015
$0.375000	June 30, 2015	June 26, 2015	July 10, 2015
$0.375000	September 30, 2015	September 25, 2015	October 9, 2015
$0.375000	December 31, 2015	December 28, 2015	January 8, 2016
$0.425000	March 31, 2016	March 25, 2016	April 8, 2016
$0.425000	June 30, 2016	June 24, 2016	July 8, 2016
$0.425000	September 30, 2016	September 30, 2016	October 14, 2016
$0.425000	December 31, 2016	December 30, 2016	January 13, 2017
$0.487500	March 31, 2017	March 31, 2017	April 14, 2017
$0.487500	June 30, 2017	June 30, 2017	July 14, 2017
$0.487500	September 30, 2017	September 29, 2017	October 13, 2017
$0.487500	December 31, 2017	December 29, 2017	January 12, 2018

Schedule of Stock by Class

	Year Ended December 31, 2017		Year Ended December 31, 2016
Shares of Common Stock sold	1,380,017		683,548
Weighted average price	$	87.46	$	73.15
Total gross proceeds	$	120,698	$	50,000
Commissions paid to sales agents	$	1,512	$	657

The following quarterly distributions have been declared and paid to our preferred stockholders since January 1, 2015 and prior to the stock's redemption, which occurred in September 2017:

Distribution Amount Per Share	For the Quarter Ending	Stockholder Record Date	Payment Date
$0.421875	March 31, 2015	March 20, 2015	March 31, 2015
$0.421875	June 30, 2015	June 19, 2015	June 30, 2015
$0.421875	September 30, 2015	September 18, 2015	September 30, 2015
$0.421875	December 31, 2015	December 11, 2015	December 31, 2015
$0.421875	March 31, 2016	March 21, 2016	March 31, 2016
$0.421875	June 30, 2016	June 17, 2016	June 30, 2016
$0.421875	September 30, 2016	September 16, 2016	September 30, 2016
$0.421875	December 31, 2016	December 15, 2016	December 31, 2016
$0.421875	March 31, 2017	March 10, 2017	March 31, 2017
$0.421875	June 30, 2017	June 15, 2017	June 30, 2017
$0.421875	September 30, 2017	September 15, 2017	October 2, 2017