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CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Cash Flows from Operating Activities:    
Net income $ 16,094 $ 13,072
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 47,019 43,482
Operating lease right-of-use assets expense 2,826 4,588
Interest accretion on landfill and environmental remediation liabilities 3,962 3,542
Amortization of debt issuance costs 1,144 1,054
Stock-based compensation 6,057 3,380
(Gain) loss on sale of property and equipment (92) 131
Southbridge Landfill non-cash closure charge (16) 41
Non-cash expense from acquisition activities 1,022 575
Deferred income taxes 7,041 1,256
Changes in assets and liabilities, net of effects of acquisitions and divestitures:    
Accounts receivable (4,712) 6,448
Landfill operating lease contract expenditures (1,478) (1,358)
Accounts payable 10,866 (6,967)
Prepaid expenses, inventories and other assets (7,192) (2,309)
Accrued expenses, contract liabilities and other liabilities (7,109) (7,910)
Net cash provided by operating activities 79,013 62,493
Cash Flows from Investing Activities:    
Acquisitions, net of cash acquired (5,481) (20,091)
Additions to property, plant and equipment (56,069) (51,570)
Proceeds from sale of property and equipment 403 200
Net cash used in investing activities (61,147) (71,461)
Cash Flows from Financing Activities:    
Proceeds from debt borrowings 500 91,200
Principal payments on debt (5,643) (82,719)
Payments of debt issuance costs 0 (11)
Proceeds from the exercise of share based awards 112 100
Net cash (used in) provided by financing activities (5,031) 8,570
Net increase (decrease) in cash and cash equivalents 12,835 (398)
Cash and cash equivalents, beginning of period 154,342 3,471
Cash and cash equivalents, end of period 167,177 3,073
Supplemental Disclosure of Cash Flow Information:    
Cash interest payments 9,701 10,733
Cash income tax payments 411 187
Non-current assets obtained through long-term financing obligations 5,894 11,859
Right-of-use assets obtained in exchange for operating lease liabilities 1,251 3,142
Landfill    
Adjustments to reconcile net income to net cash provided by operating activities:    
Operating lease right-of-use assets expense $ 3,581 $ 3,468