Consolidated Statements of Equity - USD ($) $ in Thousands	Total	Convertible Stock	Common Stock	Additional Paid-in Capital	Accumulated Other Comprehensive Loss	Accumulated Deficit	Noncontrolling Interest
BALANCE at Dec. 31, 2014	$ 176,556	$ 0	$ 3	$ 231,240	$ (246)	$ (62,477)	$ 8,036
BALANCE (in shares) at Dec. 31, 2014		1	25,802
Net income	7,677	$ 0	$ 0	0	0	6,978	699
Distributions declared on common stock ($2.50 per share)	(64,110)	0				(64,110)
Contributions from noncontrolling interest holders	538	0	0	0	0		538
Distributions to noncontrolling interest holders	(2,512)	0	0	0	0	0	(2,512)
Redemption and cancellation of shares	(1,444)	$ 0	$ 0	(1,444)	0	0	0
Redemption and cancellation of shares (in shares)		0	(217)
Reclassification of unrealized loss on currency translation to net income	250	$ 0			250	0
Foreign currency translation gain (loss)	(376)	0	$ 0	0	(376)	0	0
BALANCE at Dec. 31, 2015	116,579	$ 0	$ 3	229,796	(372)	(119,609)	6,761
BALANCE (in shares) at Dec. 31, 2015		1	25,585
Net income	4,908	$ 0	$ 0	0	0	4,943	(35)
Contributions from noncontrolling interest holders	92	0	0	0	0		92
Distributions to noncontrolling interest holders	(912)	0	0	0	0	0	(912)
Redemption and cancellation of shares	(1,905)	$ 0	$ 0	(1,905)	0	0	0
Redemption and cancellation of shares (in shares)		0	(366)
Reclassification of unrealized loss on currency translation to net income	0
Foreign currency translation gain (loss)	(123)	$ 0	$ 0	0	(123)	0	0
BALANCE at Dec. 31, 2016	118,639	$ 0	$ 3	227,891	(495)	(114,666)	5,906
BALANCE (in shares) at Dec. 31, 2016		1	25,219
Net income	29,043	$ 0	$ 0	0	0	24,558	4,485
Contributions from noncontrolling interest holders	55	0	0	0	0		55
Distributions to noncontrolling interest holders	(5,601)	0	0	0	0	0	(5,601)
Redemption and cancellation of shares	(2,969)	$ 0	$ (1)	(2,968)	0	0	0
Redemption and cancellation of shares (in shares)		0	(572)
Reclassification of unrealized loss on currency translation to net income	0
Foreign currency translation gain (loss)	468	$ 0	$ 0	0	468	0	0
BALANCE at Dec. 31, 2017	$ 139,635	$ 0	$ 2	$ 224,923	$ (27)	$ (90,108)	$ 4,845
BALANCE (in shares) at Dec. 31, 2017		1	24,647