Condensed Consolidated Statements of Comprehensive Income - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Statement of Comprehensive Income [Abstract]
Consolidated net (loss) income	$ (118,000)	$ 7,044,000	$ 3,626,000	$ 10,546,000
Other comprehensive income, before income tax:
Unrealized foreign currency translation (loss) gain	(94,000)	(15,000)	(184,000)	43,000
Unrealized gain on interest rate contracts	203,000	0	222,000	0
Reclassification adjustment to interest expense	62,000	0	148,000	0
Other comprehensive income, before income tax	171,000	(15,000)	186,000	43,000
Taxes on other comprehensive income:
Income tax benefit related to foreign currency translation adjustments	(24,000)	0	(41,000)	0
Income tax expense related to unrealized gain on interest rate contracts	51,000	0	56,000	0
Income tax expense related to reclassification adjustment to interest expense	16,000	0	38,000	0
Taxes on other comprehensive income	43,000	0	53,000	0
Other comprehensive income (loss), net of tax	128,000	(15,000)	133,000	43,000
Comprehensive income	10,000	7,029,000	3,759,000	10,589,000
Less: Net income attributable to noncontrolling interest in subsidiary	323,000	321,000	886,000	983,000
Comprehensive (loss) income attributable to common shareholders	$ (313,000)	$ 6,708,000	$ 2,873,000	$ 9,606,000