Condensed Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Statement of Comprehensive Income [Abstract]
Consolidated net income	$ 1,824	$ 5,220	$ 3,744	$ 3,502
Other comprehensive income, before income tax:
Unrealized foreign currency translation (loss) gain	(63)	24	(90)	58
Unrealized gain on interest rate contracts	247	0	19	0
Reclassification adjustment to interest expense	86	0	86	0
Other comprehensive income, before income tax	270	24	15	58
Taxes on other comprehensive income:
Income tax benefit related to foreign currency translation adjustments	(13)	0	(17)	0
Income tax expense related to unrealized gain on interest rate contracts	62	0	5	0
Income tax expense related to reclassification adjustment to interest expense	22	0	22	0
Taxes on other comprehensive income	71	0	10	0
Other comprehensive income, net of tax	199	24	5	58
Comprehensive income	2,023	5,244	3,749	3,560
Less: Net income attributable to noncontrolling interest in subsidiary	285	370	563	662
Comprehensive income attributable to common shareholders	$ 1,738	$ 4,874	$ 3,186	$ 2,898