CONSOLIDATED STATEMENTS OF COMPREHENSIVE LOSS - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Statement of Comprehensive Income [Abstract]
Net loss	$ (3,910)	$ (224)
Hedging activity:
Interest rate swap settlements	(61)	(44)
Interest rate swap amounts reclassified into interest expense	53	69
Unrealized gain (loss) resulting from changes in fair value of derivative instruments	785	(66)
Unrealized gain resulting from changes in fair value of marketable securities	0	23
Other comprehensive income (loss)	777	(18)
Income tax expense related to items of other comprehensive income (loss)	209	0
Other comprehensive income (loss), net of tax	568	(18)
Comprehensive loss attributable to common stockholders	$ (3,342)	$ (242)