CONDENSED CONSOLIDATED STATEMENTS OF EQUITY - USD ($) $ in Thousands	Common Stock	Additional Paid-in Capital	Accumulated Other Comprehensive Income (Loss)	Distributions in Excess of Net Income	Total Stockholders' Equity	Noncontrolling Interests	Total
Balance at Dec. 31, 2017	$ 338	$ 457,495	$ 753	$ (177,566)	$ 281,020	$ 137,624	$ 418,644
Balance (in shares) at Dec. 31, 2017	34,240,815
Increase (Decrease) in Stockholders' Equity
Redemption of noncontrolling interests		70			70	(70)
Redemption of noncontrolling interests (in shares)	7,056
Issuance of stock awards, net of forfeitures (in shares)	201,181
Exercise of stock options		100			100		100
Exercise of stock options (in shares)	5,161
Share-based compensation	$ 2	2,739			2,741		2,741
Dividends and distributions				(33,749)	(33,749)	(13,553)	(47,302)
Net income				20,302	20,302	8,264	28,566
Other comprehensive income			410		410	167	577
Balance at Mar. 31, 2018	$ 340	460,404	1,163	(191,013)	270,894	132,432	403,326
Balance (in shares) at Mar. 31, 2018	34,454,213
Balance at Dec. 31, 2017	$ 338	457,495	753	(177,566)	281,020	137,624	418,644
Balance (in shares) at Dec. 31, 2017	34,240,815
Increase (Decrease) in Stockholders' Equity
Net income							80,865
Balance at Sep. 30, 2018	$ 363	487,848	1,758	(226,184)	263,785	99,840	363,625
Balance (in shares) at Sep. 30, 2018	36,698,420
Balance at Mar. 31, 2018	$ 340	460,404	1,163	(191,013)	270,894	132,432	403,326
Balance (in shares) at Mar. 31, 2018	34,454,213
Increase (Decrease) in Stockholders' Equity
Issuance of stock awards, net of forfeitures (in shares)	(2,205)
Exercise of stock options		119			119		119
Exercise of stock options (in shares)	7,720
Share-based compensation		3,364			3,364		3,364
Dividends and distributions				(35,424)	(35,424)	(14,244)	(49,668)
Net income				19,389	19,389	7,890	27,279
Other comprehensive income			128		128	52	180
Balance at Jun. 30, 2018	$ 340	463,887	1,291	(207,048)	258,470	126,130	384,600
Balance (in shares) at Jun. 30, 2018	34,459,728
Increase (Decrease) in Stockholders' Equity
Redemption of noncontrolling interests	$ 23	20,747	127		20,897	(20,897)
Redemption of noncontrolling interests (in shares)	2,250,000
Issuance of stock awards, net of forfeitures (in shares)	(11,308)
Share-based compensation		3,214			3,214		3,214
Dividends and distributions				(37,736)	(37,736)	(11,927)	(49,663)
Net income				18,600	18,600	6,420	25,020
Other comprehensive income			340		340	114	454
Balance at Sep. 30, 2018	$ 363	487,848	1,758	(226,184)	263,785	99,840	363,625
Balance (in shares) at Sep. 30, 2018	36,698,420
Balance at Dec. 31, 2018	$ 363	491,314	(2,193)	(246,929)	242,555	92,078	334,633
Balance (in shares) at Dec. 31, 2018	36,708,691
Increase (Decrease) in Stockholders' Equity
Issuance of stock awards, net of forfeitures (in shares)	192,009
Exercise of stock options		17			17		17
Exercise of stock options (in shares)	1,129
Share-based compensation	$ 1	3,592			3,593		3,593
Dividends and distributions				(40,581)	(40,581)	(12,733)	(53,314)
Net income				19,661	19,661	6,244	25,905
Other comprehensive income			(3,540)		(3,540)	(1,124)	(4,664)
Balance at Mar. 31, 2019	$ 364	494,923	(5,733)	(267,849)	221,705	84,465	306,170
Balance (in shares) at Mar. 31, 2019	36,901,829
Balance at Dec. 31, 2018	$ 363	491,314	(2,193)	(246,929)	242,555	92,078	334,633
Balance (in shares) at Dec. 31, 2018	36,708,691
Increase (Decrease) in Stockholders' Equity
Net income							74,292
Balance at Sep. 30, 2019	$ 373	508,209	(6,666)	(321,720)	180,196	63,130	243,326
Balance (in shares) at Sep. 30, 2019	37,688,382
Balance at Mar. 31, 2019	$ 364	494,923	(5,733)	(267,849)	221,705	84,465	306,170
Balance (in shares) at Mar. 31, 2019	36,901,829
Increase (Decrease) in Stockholders' Equity
Redemption of noncontrolling interests		20			20	(20)
Redemption of noncontrolling interests (in shares)	2,770
Issuance of stock awards, net of forfeitures (in shares)	(15,567)
Exercise of stock options		21			21		21
Exercise of stock options (in shares)	1,339
Share-based compensation		3,864			3,864		3,864
Dividends and distributions				(44,895)	(44,895)	(14,118)	(59,013)
Net income				19,535	19,535	6,208	25,743
Other comprehensive income			(502)		(502)	(160)	(662)
Balance at Jun. 30, 2019	$ 364	498,828	(6,235)	(293,209)	199,748	76,375	276,123
Balance (in shares) at Jun. 30, 2019	36,890,371
Increase (Decrease) in Stockholders' Equity
Redemption of noncontrolling interests	$ 8	5,394	(174)		5,228	(5,228)
Redemption of noncontrolling interests (in shares)	800,840
Issuance of stock awards, net of forfeitures (in shares)	(3,983)
Exercise of stock options		28			28		28
Exercise of stock options (in shares)	1,154
Share-based compensation	$ 1	3,959			3,960		3,960
Dividends and distributions				(45,961)	(45,961)	(13,142)	(59,103)
Net income				17,450	17,450	5,194	22,644
Other comprehensive income			(257)		(257)	(69)	(326)
Balance at Sep. 30, 2019	$ 373	$ 508,209	$ (6,666)	$ (321,720)	$ 180,196	$ 63,130	$ 243,326
Balance (in shares) at Sep. 30, 2019	37,688,382