CONSOLIDATED STATEMENTS OF OPERATIONS (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Income Statement [Abstract]
Revenues	$ 182,910	$ 163,664
Operating expenses:
Cost of operations	128,518	117,759
General and administration	24,352	22,742
Depreciation and amortization	21,406	17,489
Expense from acquisition activities and other items	1,009	677
Southbridge landfill closure charge	613	555
Total operating expenses	175,898	159,222
Operating income	7,012	4,442
Other expense (income):
Interest income	(51)	(117)
Interest expense	5,952	6,460
Other expense (income), net	43	(216)
Other expense, net	5,944	6,127
Income (loss) before income taxes	1,068	(1,685)
Provision for income taxes	109	29
Net income (loss)	$ 959	$ (1,714)
Basic earnings per share attributable to common stockholders:
Weighted average common shares outstanding	48,005	45,913
Basic earnings per common share (in dollars per share)	$ 0.02	$ (0.04)
Diluted earnings per share attributable to common stockholders:
Weighted average common shares outstanding	48,262	45,913
Diluted earnings per common share (in dollars per share)	$ 0.02	$ (0.04)