CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Statement of Comprehensive Income [Abstract]
Net income (loss)	$ 31,653	$ 6,420	$ (21,799)
Hedging activity:
Interest rate swap settlements	(498)	(361)	(410)
Interest rate swap amounts reclassified into interest expense	553	363	421
Unrealized (loss) gain resulting from changes in fair value of derivative instruments	(4,788)	(1,476)	267
Unrealized gain resulting from changes in fair value of marketable securities	0	0	59
Other comprehensive (loss) income	(4,733)	(1,474)	337
Tax effect related to items of other comprehensive (loss) income	0	0	85
Other comprehensive (loss) income, net of tax	(4,733)	(1,474)	252
Comprehensive income (loss)	$ 26,920	$ 4,946	$ (21,547)