CONDENSED CONSOLIDATED STATEMENTS OF EQUITY - USD ($) $ in Thousands	Total	Class A Common Stock	Common Stock Class A Common Stock	Additional Paid-In Capital	Accumulated Other Comprehensive Loss	Cumulative Dividends in Excess of Earnings	Total Stockholders’ Equity	Noncontrolling Interests
Beginning balance at Dec. 31, 2015	$ 1,406,958		$ 1,270	$ 2,328,806	$ 0	$ (950,652)	$ 1,379,424	$ 27,534
Beginning balance (in shares) at Dec. 31, 2015			127,027,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock, net	417,163		$ 141	417,022			417,163
Issuance of common stock, net (in shares)			14,138,000
Issuance of operating partnership units in connection with an acquisition	71,754							71,754
Share-based award transactions, net	5,136		$ 4	5,132			5,136
Share-based award transactions, net (in shares)			393,000
Repurchase and cancellation of common stock	(2,425)		$ (1)	(2,424)			(2,425)
Repurchase and cancellation of common stock (in shares)			(87,000)
Redemption of noncontrolling interest and other	(676)		$ 3	5,030			5,033	(5,709)
Redemption of noncontrolling interest and other (in shares)			257,000
Dividends declared	(124,820)					(121,686)	(121,686)	(3,134)
Net income	30,163					29,361	29,361	802
Other comprehensive loss	0
Ending balance at Sep. 30, 2016	1,803,253		$ 1,417	2,753,566	0	(1,042,977)	1,712,006	91,247
Ending balance (in shares) at Sep. 30, 2016			141,728,000
Beginning balance at Dec. 31, 2016	1,780,417		$ 1,417	2,754,818	0	(1,068,961)	1,687,274	93,143
Beginning balance (in shares) at Dec. 31, 2016		141,719,134	141,719,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock, net	1,624,222		$ 586	1,623,636			1,624,222
Issuance of common stock, net (in shares)			58,623,000
Issuance of operating partnership units in connection with an acquisition	610							610
Share-based award transactions, net	5,493		$ 3	5,490			5,493
Share-based award transactions, net (in shares)			234,000
Repurchase and cancellation of common stock	(3,413)		$ (1)	(3,412)			(3,413)
Repurchase and cancellation of common stock (in shares)			(116,000)
Redemption of noncontrolling interest and other	0		$ 2	5,692			5,694	(5,694)
Redemption of noncontrolling interest and other (in shares)			227,000
Dividends declared	(168,416)					(164,480)	(164,480)	(3,936)
Net income	22,025					21,390	21,390	635
Other comprehensive loss	(631)				(615)		(615)	(16)
Ending balance at Sep. 30, 2017	$ 3,260,307		$ 2,007	$ 4,386,224	$ (615)	$ (1,212,051)	$ 3,175,565	$ 84,742
Ending balance (in shares) at Sep. 30, 2017		200,686,673	200,687,000