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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Cash Flows from Operating Activities:      
Net income $ 91,106,000 $ 31,653,000 $ 6,420,000
Adjustments to reconcile net income to net cash provided by operating activities:      
Depreciation and amortization 90,782,000 79,790,000 70,508,000
Operating lease right-of-use assets expense 8,476,000 9,559,000 0
Depletion of landfill operating lease obligations     9,724,000
Interest accretion on landfill and environmental remediation liabilities 7,090,000 6,976,000 5,708,000
Amortization of debt issuance costs and discount on long-term debt 2,169,000 2,293,000 2,449,000
Stock-based compensation 8,219,000 7,223,000 8,445,000
Loss (gain) on sale of property and equipment 936,000 (892,000) (492,000)
Southbridge Landfill non-cash closure charge, net 263,000 74,000 16,179,000
Southbridge Landfill insurance recovery for investing activities 0 0 (3,506,000)
Development project charge 0 0 311,000
Non-cash expense from acquisition activities and other items 554,000 65,000 757,000
Loss on debt extinguishment 0 0 7,352,000
Impairment of investments 0 0 1,069,000
Withdrawal costs - multiemployer pension plan 0 2,230,000 0
Deferred income taxes (52,288,000) (1,244,000) 1,250,000
Changes in assets and liabilities, net of effects of acquisitions and divestitures:      
Accounts receivable 5,815,000 (5,464,000) (5,833,000)
Landfill operating lease contract expenditures (5,386,000) (5,307,000) 0
Accounts payable (15,226,000) 6,762,000 9,091,000
Prepaid expenses, inventories and other assets (1,211,000) (1,669,000) 535,000
Accrued expenses, contract liabilities and other liabilities (9,158,000) (22,931,000) (9,133,000)
Net cash provided by operating activities 139,922,000 116,829,000 120,834,000
Cash Flows from Investing Activities:      
Acquisitions, net of cash acquired (32,457,000) (75,379,000) (88,918,000)
Additions to property, plant and equipment (108,108,000) (103,165,000) (73,232,000)
Payments on landfill operating lease contracts 0 0 (7,415,000)
Proceeds from sale of property and equipment 533,000 750,000 870,000
Proceeds from property insurance settlement 0 332,000 992,000
Net cash used in investing activities (140,032,000) (177,462,000) (164,197,000)
Cash Flows from Financing Activities:      
Proceeds from debt borrowings 157,000,000 197,800,000 634,700,000
Principal payments on debt (149,378,000) (243,374,000) (584,223,000)
Payments of debt issuance costs (1,531,000) (749,000) (5,573,000)
Proceeds from the exercise of share based awards 100,000 3,355,000 471,000
Proceeds from the public offering of Class A Common Stock 144,790,000 100,446,000 0
Proceeds from unregistered sale of Class A Common Stock 0 2,619,000 0
Net cash provided by financing activities 150,981,000 60,097,000 45,375,000
Net increase (decrease) in cash and cash equivalents 150,871,000 (536,000) 2,012,000
Cash and cash equivalents, beginning of period 3,471,000 4,007,000 1,995,000
Cash and cash equivalents, end of period 154,342,000 3,471,000 4,007,000
Supplemental Disclosures of Cash Flow Information:      
Interest 20,117,000 23,183,000 23,523,000
Income tax (refunds) payments, net (1,534,000) (1,631,000) 105,000
Supplemental Disclosures of Non-Cash Investing and Financing Activities:      
Non-current assets acquired through long-term obligations 18,069,000 13,053,000 7,092,000
Landfills      
Adjustments to reconcile net income to net cash provided by operating activities:      
Operating lease right-of-use assets expense 7,781,000 7,711,000  
Cash Flows from Investing Activities:      
Proceeds from property insurance settlement $ 0 $ 0 $ 3,506,000