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CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Cash Flows from Operating Activities:    
Net income $ 13,072 $ 10,201
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 43,482 37,204
Operating lease right-of-use assets expense 4,588 4,921
Interest accretion on landfill and environmental remediation liabilities 3,542 3,579
Amortization of debt issuance costs 1,054 1,149
Stock-based compensation 3,380 3,320
Loss (gain) on sale of property and equipment 131 (327)
Southbridge Landfill non-cash closure charge 41 179
Non-cash expense from acquisition activities 575 (68)
Deferred income taxes 1,256 (1,565)
Changes in assets and liabilities, net of effects of acquisitions and divestitures:    
Accounts receivable 6,448 (10,057)
Landfill operating lease contract expenditures (1,358) (2,140)
Accounts payable (6,967) 3,995
Prepaid expenses, inventories and other assets (2,309) (2,975)
Accrued expenses, contract liabilities and other liabilities (7,910) (12,788)
Net cash provided by operating activities 62,493 38,251
Cash Flows from Investing Activities:    
Acquisitions, net of cash acquired (20,091) (27,687)
Additions to property, plant and equipment (51,570) (46,659)
Proceeds from sale of property and equipment 200 363
Net cash used in investing activities (71,461) (73,983)
Cash Flows from Financing Activities:    
Proceeds from debt borrowings 91,200 41,400
Principal payments on debt (82,719) (109,241)
Payments of debt issuance costs (11) 0
Proceeds from the exercise of share based awards 100 2,277
Proceeds from the public issuance of Class A Common Stock 0 100,446
Net cash provided by financing activities 8,570 34,882
Net decrease in cash and cash equivalents (398) (850)
Cash and cash equivalents, beginning of period 3,471 4,007
Cash and cash equivalents, end of period 3,073 3,157
Cash paid during the period for:    
Interest 10,733 11,672
Income taxes, net of refunds 187 16
Supplemental Disclosure of Non-Cash Investing and Financing Activities:    
Non-current assets obtained through long-term obligations 11,859 9,333
Landfill    
Adjustments to reconcile net income to net cash provided by operating activities:    
Operating lease right-of-use assets expense $ 3,468 $ 3,623