Condensed Consolidated Statements of Equity - USD ($) $ in Thousands	Total	Common Stock	Additional Paid-in Capital	Cumulative Distributions in Excess of Earnings
Beginning balance at Dec. 31, 2019	$ 927,591	$ 951	$ 1,162,990	$ (236,350)
Beginning balance (in shares) at Dec. 31, 2019		95,103,270
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock, net	(90)		(90)
Vesting of restricted common stock, net of shares withheld for employee taxes	(1,986)	$ 1	(1,987)
Vesting of restricted common stock, net of shares withheld for employee taxes (in shares)		93,061
Amortization of stock-based compensation	884		884
Common dividends	(23,931)			(23,931)
Net income	19,325			19,325
Ending balance at Mar. 31, 2020	921,793	$ 952	1,161,797	(240,956)
Ending balance (in shares) at Mar. 31, 2020		95,196,331
Beginning balance at Dec. 31, 2019	927,591	$ 951	1,162,990	(236,350)
Beginning balance (in shares) at Dec. 31, 2019		95,103,270
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	59,812
Ending balance at Sep. 30, 2020	916,036	$ 952	1,163,418	(248,334)
Ending balance (in shares) at Sep. 30, 2020		95,214,080
Beginning balance at Mar. 31, 2020	921,793	$ 952	1,161,797	(240,956)
Beginning balance (in shares) at Mar. 31, 2020		95,196,331
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock, net	(314)		(314)
Vesting of restricted common stock, net of shares withheld for employee taxes (in shares)		17,749
Amortization of stock-based compensation	963		963
Common dividends	(23,931)			(23,931)
Net income	18,935			18,935
Ending balance at Jun. 30, 2020	917,446	$ 952	1,162,446	(245,952)
Ending balance (in shares) at Jun. 30, 2020		95,214,080
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Amortization of stock-based compensation	972		972
Common dividends	(23,934)			(23,934)
Net income	21,552			21,552
Ending balance at Sep. 30, 2020	916,036	$ 952	1,163,418	(248,334)
Ending balance (in shares) at Sep. 30, 2020		95,214,080
Beginning balance at Dec. 31, 2020	914,142	$ 952	1,164,402	(251,212)
Beginning balance (in shares) at Dec. 31, 2020		95,215,797
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock, net	16,191	$ 7	16,184
Issuance of common stock, net, (in shares)		702,000
Vesting of restricted common stock, net of shares withheld for employee taxes	(1,330)	$ 1	(1,331)
Vesting of restricted common stock, net of shares withheld for employee taxes (in shares)		63,265
Amortization of stock-based compensation	1,585		1,585
Common dividends	(25,633)			(25,633)
Net income	20,486			20,486
Ending balance at Mar. 31, 2021	925,441	$ 960	1,180,840	(256,359)
Ending balance (in shares) at Mar. 31, 2021		95,981,062
Beginning balance at Dec. 31, 2020	914,142	$ 952	1,164,402	(251,212)
Beginning balance (in shares) at Dec. 31, 2020		95,215,797
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	53,721
Ending balance at Sep. 30, 2021	917,615	$ 963	1,191,204	(274,552)
Ending balance (in shares) at Sep. 30, 2021		96,296,673
Beginning balance at Mar. 31, 2021	925,441	$ 960	1,180,840	(256,359)
Beginning balance (in shares) at Mar. 31, 2021		95,981,062
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock, net	6,755	$ 3	6,752
Issuance of common stock, net, (in shares)		288,000
Vesting of restricted common stock, net of shares withheld for employee taxes (in shares)		27,611
Amortization of stock-based compensation	1,810		1,810
Common dividends	(25,714)			(25,714)
Net income	21,317			21,317
Ending balance at Jun. 30, 2021	929,609	$ 963	1,189,402	(260,756)
Ending balance (in shares) at Jun. 30, 2021		96,296,673
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Amortization of stock-based compensation	1,802		1,802
Common dividends	(25,714)			(25,714)
Net income	11,918			11,918
Ending balance at Sep. 30, 2021	$ 917,615	$ 963	$ 1,191,204	$ (274,552)
Ending balance (in shares) at Sep. 30, 2021		96,296,673