CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE LOSS - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE LOSS
Operating Revenues	$ 11,748	$ 38,979
Operating costs:
Operating expenses	10,942	29,016
General and administrative	2,807	3,674
Depreciation and amortization	3,434	4,904
Total cost and expenses	17,183	37,594
Loss from operations	(5,435)	1,385
Other income (expense):
Interest income	70	105
Interest expense	(6)	(40)
Other income (expense), net	143	(458)
(Loss) income before income tax	(5,228)	992
Income tax benefit		1
Net (loss) income	(5,228)	993
Other comprehensive income (loss):
Net unrealized income (loss) on foreign exchange rate translation, net	201	(1,199)
Comprehensive loss	$ (5,027)	$ (206)
Basic (loss) income per share of common stock	$ (0.22)	$ 0.04
Diluted (loss) income per share of common stock	$ (0.22)	$ 0.04
Weighted average equivalent common shares outstanding	23,478,072	23,287,410
Weighted average equivalent common shares outstanding - assuming dilution	23,478,072	23,465,651