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CONSOLIDATED STATEMENTS OF OPERATIONS (Unaudited) - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Income Statement [Abstract]    
Revenues $ 163,664 $ 147,455
Operating expenses:    
Cost of operations 117,759 105,610
General and administration 22,742 21,027
Depreciation and amortization 17,489 15,983
Expense from acquisition activities and other items 677 0
Southbridge Landfill closure charge, net 555 1,586
Contract settlement charge 0 2,100
Development project charge 0 311
Total operating expenses 159,222 146,617
Operating income 4,442 838
Other expense (income):    
Interest income (117) (29)
Interest expense 6,460 6,454
Other income (216) (89)
Other expense, net 6,127 6,336
Loss before income taxes (1,685) (5,498)
Provision (benefit) for income taxes 29 (1,588)
Net loss $ (1,714) $ (3,910)
Basic and diluted earnings per share attributable to common stockholders:    
Basic and diluted weighted average common share outstanding (in shares) 45,913 42,370
Basic and diluted earnings per common share (in dollars per share) $ (0.04) $ (0.09)