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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Cash Flows from Operating Activities:      
Net income $ 41,100 $ 91,106 $ 31,653
Adjustments to reconcile net income to net cash provided by operating activities:      
Depreciation and amortization 103,590 90,782 79,790
Interest accretion on landfill and environmental remediation liabilities 7,324 7,090 6,976
Amortization of debt issuance costs on long-term debt 2,288 2,169 2,293
Stock-based compensation 11,551 8,219 7,223
Operating lease right-of-use assets expense 13,827 16,257 17,270
Loss (gain) on sale of property and equipment 172 936 (892)
Southbridge Landfill non-cash closure (credit) charge, net (356) 263 74
Non-cash expense from acquisition activities 315 554 65
Environmental remediation charge 924 0 0
Withdrawal costs - multiemployer pension plan 0 0 2,230
Deferred income taxes 15,073 (52,288) (1,244)
Changes in assets and liabilities, net of effects of acquisitions and divestitures:      
Accounts receivable (7,422) 5,815 (5,464)
Landfill operating lease contract expenditures (5,655) (5,386) (5,307)
Accounts payable 13,888 (15,226) 6,762
Prepaid expenses, inventories and other assets (6,343) (1,211) (1,669)
Accrued expenses, contract liabilities and other liabilities (7,539) (9,158) (22,931)
Net cash provided by operating activities 182,737 139,922 116,829
Cash Flows from Investing Activities:      
Acquisitions, net of cash acquired (170,647) (32,457) (75,379)
Additions to property, plant and equipment (123,295) (108,108) (103,165)
Proceeds from sale of property and equipment 788 533 750
Proceeds from property insurance settlement 0 0 332
Net cash used in investing activities (293,154) (140,032) (177,462)
Cash Flows from Financing Activities:      
Proceeds from debt borrowings 3,701 157,000 197,800
Principal payments on debt (10,305) (149,378) (243,374)
Payments of debt issuance costs (3,684) (1,531) (749)
Proceeds from the exercise of share based awards 172 100 3,355
Proceeds from the public offering of Class A Common Stock 0 144,790 100,446
Proceeds from unregistered sale of Class A Common Stock 0 0 2,619
Net cash (used in) provided by financing activities (10,116) 150,981 60,097
Net (decrease) increase in cash and cash equivalents (120,533) 150,871 (536)
Cash and cash equivalents, beginning of period 154,342 3,471 4,007
Cash and cash equivalents, end of period 33,809 154,342 3,471
Supplemental Disclosures of Cash Flow Information:      
Interest 19,025 20,117 23,183
Income tax payments (refunds), net 1,438 (1,534) (1,631)
Supplemental Disclosures of Non-Cash Investing and Financing Activities:      
Non-current assets acquired through long-term financing obligations $ 20,753 $ 18,069 $ 13,053