CONDENSED CONSOLIDATED STATEMENTS OF EQUITY - USD ($) $ in Thousands	Total	Class A Common Stock	Total Stockholders’ Equity	Common Stock Class A Common Stock	Additional Paid-In Capital	Accumulated Other Comprehensive Gain (Loss)	Cumulative Dividends in Excess of Earnings	Noncontrolling Interests
Beginning balance at Dec. 31, 2016	$ 1,780,417		$ 1,687,274	$ 1,417	$ 2,754,818	$ 0	$ (1,068,961)	$ 93,143
Beginning balance (in shares) at Dec. 31, 2016				141,719,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of operating partnership units in connection with an acquisition	610							610
Share-based award transactions, net	2,530		2,530	$ 2	2,528
Share-based award transactions, net (in shares)				213,000
Repurchase and cancellation of common stock	(3,118)		(3,118)	$ (1)	(3,117)
Repurchase and cancellation of common stock (in shares)				(107,000)
Dividends declared	(44,466)		(43,145)				(43,145)	(1,321)
Net income	13,970		13,545				13,545	425
Other comprehensive gain (loss)	(88)		(85)			(85)		(3)
Ending balance at Mar. 31, 2017	1,749,855		1,657,001	$ 1,418	2,754,229	(85)	(1,098,561)	92,854
Ending balance (in shares) at Mar. 31, 2017				141,825,000
Beginning balance at Dec. 31, 2017	3,363,448		3,278,782	$ 2,049	4,508,528	274	(1,232,069)	84,666
Beginning balance (in shares) at Dec. 31, 2017		204,892,118		204,892,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Share-based award transactions, net	3,507		3,507	$ 3	3,504
Share-based award transactions, net (in shares)				289,000
Repurchase and cancellation of common stock	(2,709)		(2,709)	$ (1)	(2,708)
Repurchase and cancellation of common stock (in shares)				(92,000)
Redemption of noncontrolling interest and other	0		2,413	$ 1	2,412			(2,413)
Redemption of noncontrolling interest and other (in shares)				91,000
Dividends declared	(63,866)		(62,559)				(62,559)	(1,307)
Net income	9,983		9,802				9,802	181
Other comprehensive gain (loss)	900		883			883		17
Ending balance at Mar. 31, 2018	$ 3,311,263		$ 3,230,119	$ 2,052	$ 4,511,736	$ 1,157	$ (1,284,826)	$ 81,144
Ending balance (in shares) at Mar. 31, 2018		205,179,776		205,180,000