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	91,269		$ 34	91,235			91,269
Issuance of common stock (in shares)			3,418,000
Share-based award transactions, net	1,803		$ 2	1,801			1,803
Share-based award transactions, net (in shares)			191,000
Repurchase and cancellation of common stock	(1,901)			(1,901)			(1,901)
Repurchase and cancellation of common stock (in shares)			(70,000)
Redemption of noncontrolling interest and other	0		$ 1	2,197			2,198	(2,198)
Redemption of noncontrolling interest and other (in shares)			96,000
Dividends declared	(39,083)					(38,540)	(38,540)	(543)
Net income	10,005					9,860	9,860	145
Other comprehensive loss	0
Ending balance at Mar. 31, 2016	1,469,051		$ 1,307	2,422,138	0	(979,332)	1,444,113	24,938
Ending balance (in shares) at Mar. 31, 2016			130,662,000
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 operating partnership units in connection with an acquisition	610							610
Share-based award transactions, net	2,530		$ 2	2,528			2,530
Share-based award transactions, net (in shares)			213,000
Repurchase and cancellation of common stock	(3,118)		$ (1)	(3,117)			(3,118)
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 loss	(88)				(85)		(85)	(3)
Ending balance at Mar. 31, 2017	$ 1,749,855		$ 1,418	$ 2,754,229	$ (85)	$ (1,098,561)	$ 1,657,001	$ 92,854
Ending balance (in shares) at Mar. 31, 2017		141,825,110	141,825,000