Consolidated Statements of Equity - USD ($) $ in Thousands	Total	Common Shares	Additional Paid - In Capital	Retained earnings (distributions in excess of retained earnings)	Total Shareholders’ Equity	Noncontrolling Interest in Operating Partnership
Beginning Balance (in shares) at Dec. 31, 2018		46,525,652
Beginning Balance at Dec. 31, 2018	$ 807,418	$ 465	$ 896,286	$ (99,285)	$ 797,466	$ 9,952
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of shares pursuant to Equity Incentive Plan (in shares)		27,870
Issuance of shares pursuant to Equity Incentive Plan	500		500		500
Issuance of shares, net of offering costs (in shares)		364,861
Issuance of shares, net of offering costs	6,919	$ 4	6,915		6,919
Amortization of share based compensation	2,072		31		31	2,041
Dividends declared on common shares	(30,814)			(30,814)	(30,814)
Distributions declared on LTIP units	(651)					(651)
Reallocation of noncontrolling interest	0		337		337	(337)
Net loss	11,153			11,050	11,050	103
Ending Balance (in shares) at Jun. 30, 2019		46,918,383
Ending Balance at Jun. 30, 2019	796,597	$ 469	904,069	(119,049)	785,489	11,108
Beginning Balance (in shares) at Mar. 31, 2019		46,571,005
Beginning Balance at Mar. 31, 2019	794,917	$ 466	897,161	(113,039)	784,588	10,329
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of shares, net of offering costs (in shares)		347,378
Issuance of shares, net of offering costs	6,826	$ 3	6,823		6,826
Amortization of share based compensation	1,125		15		15	1,110
Dividends declared on common shares	(15,447)			(15,447)	(15,447)
Distributions declared on LTIP units	(349)					(349)
Reallocation of noncontrolling interest	0		70		70	70
Net loss	9,525			9,437	9,437	88
Ending Balance (in shares) at Jun. 30, 2019		46,918,383
Ending Balance at Jun. 30, 2019	796,597	$ 469	904,069	(119,049)	785,489	11,108
Beginning Balance (in shares) at Dec. 31, 2019		46,928,445
Beginning Balance at Dec. 31, 2019	775,024	$ 469	904,273	(142,365)	762,377	12,647
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of shares pursuant to Equity Incentive Plan (in shares)		24,516
Issuance of shares pursuant to Equity Incentive Plan	450		450		450
Issuance of shares, net of offering costs (in shares)		12,866
Issuance of shares, net of offering costs	126	$ 1	125		126
Amortization of share based compensation	2,412		15		15	2,397
Dividends declared on common shares	(10,331)			(10,331)	(10,331)
Distributions declared on LTIP units	(233)					(233)
Reallocation of noncontrolling interest	0		1,114		1,114	(1,114)
Net loss	(55,304)			(54,610)	(54,610)	(694)
Ending Balance (in shares) at Jun. 30, 2020		46,965,827
Ending Balance at Jun. 30, 2020	712,144	$ 470	905,977	(207,306)	699,141	13,003
Beginning Balance (in shares) at Mar. 31, 2020		46,960,389
Beginning Balance at Mar. 31, 2020	738,270	$ 469	905,936	(180,479)	725,926	12,344
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of shares, net of offering costs (in shares)		5,438
Issuance of shares, net of offering costs	36	$ 1	35		36
Amortization of share based compensation	1,031		6		6	1,025
Net loss	(27,193)			(26,827)	(26,827)	(366)
Ending Balance (in shares) at Jun. 30, 2020		46,965,827
Ending Balance at Jun. 30, 2020	$ 712,144	$ 470	$ 905,977	$ (207,306)	$ 699,141	$ 13,003