Condensed Consolidated Statement Of Stockholders' Equity - 3 months ended Mar. 31, 2017 - USD ($) $ in Thousands	Total	Common Stock [Member]	Additional Paid in Capital [Member]	Accumulated Distributions in Excess of Earnings [Member]	Accumulated Other Comprehensive Income [Member]	Total Stockholders' Equity [Member]	Noncontrolling Interests [Member]
Balance, (in shares) at Dec. 31, 2016	184,909,673	184,909,673
Balance, at Dec. 31, 2016	$ 1,404,944	$ 1,849	$ 1,625,862	$ (258,878)	$ 1,823	$ 1,370,656	$ 34,288
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Vesting of restricted stock (in shares)		0
Vesting of restricted stock	23		23			23	0
Issuance of common stock under the distribution reinvestment plan (in shares)		1,744,228
Issuance of common stock under the distribution reinvestment plan	16,621	$ 17	16,604			16,621	0
Distributions to noncontrolling interests	(834)					0	(834)
Distributions declared to common stockholders	(31,993)			(31,993)		(31,993)	0
Other offering costs	(5)		(5)			(5)	0
Repurchase of common stock (in shares)		(1,232,088)
Repurchase of common stock	(12,101)	$ (12)	(12,089)			(12,101)	0
Other comprehensive income	1,503				1,503	1,503	0
Net income	$ 9,984			8,903		8,903	1,081
Balance, (in shares) at Mar. 31, 2017	185,421,813	185,421,813
Balance, at Mar. 31, 2017	$ 1,388,142	$ 1,854	$ 1,630,395	$ (281,968)	$ 3,326	$ 1,353,607	$ 34,535