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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Statement of Comprehensive Income [Abstract]
Net income (loss)	$ 6,420	$ (21,799)	$ (6,858)
Other comprehensive (loss) income, before tax:
Interest rate swap settlements	(361)	(410)	0
Interest rate swap amounts reclassified into interest expense	363	421	0
Unrealized (loss) gain resulting from changes in fair value of derivative instruments	(1,476)	267	0
Unrealized gain (loss) resulting from changes in fair value of marketable securities	0	59	(75)
Other comprehensive (loss) income	(1,474)	337	(75)
Tax effect related to items of other comprehensive (loss) income	0	85	0
Other comprehensive (loss) income, net of tax	(1,474)	252	(75)
Comprehensive income (loss)	4,946	(21,547)	(6,933)
Less: Net loss attributable to noncontrolling interests	0	0	(9)
Comprehensive income (loss) attributable to common stockholders	$ 4,946	$ (21,547)	$ (6,924)

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