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CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Cash Flows from Operating Activities:    
Net income $ 4,311 $ 959
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 22,682 21,406
Operating lease right-of-use assets expense 1,411 2,417
Interest accretion on landfill and environmental remediation liabilities 1,957 1,794
Amortization of debt issuance costs 572 527
Stock-based compensation 2,941 1,562
(Gain) loss on sale of property and equipment (24) 137
Southbridge Landfill non-cash closure charge (7) 51
Non-cash expense from acquisition activities 146 532
Deferred income taxes 2,300 967
Changes in assets and liabilities, net of effects of acquisitions and divestitures:    
Accounts receivable 7,872 6,507
Landfill operating lease contract expenditures (160) (50)
Accounts payable 1,349 (10,588)
Prepaid expenses, inventories and other assets (2,077) (171)
Accrued expenses, contract liabilities and other liabilities (12,730) (12,932)
Net cash provided by operating activities 32,147 14,791
Cash Flows from Investing Activities:    
Acquisitions, net of cash acquired (4,568) (5,144)
Additions to property, plant and equipment (26,832) (19,851)
Proceeds from sale of property and equipment 123 51
Net cash used in investing activities (31,277) (24,944)
Cash Flows from Financing Activities:    
Proceeds from debt borrowings 0 73,500
Principal payments on debt (2,769) (40,686)
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 (2,657) 32,903
Net (decrease) increase in cash and cash equivalents (1,787) 22,750
Cash and cash equivalents, beginning of period 154,342 3,471
Cash and cash equivalents, end of period 152,555 26,221
Supplemental Disclosure of Cash Flow Information:    
Cash interest payments 5,020 5,372
Cash income tax payments 238 84
Non-current assets obtained through long-term financing obligations 4,569 6,469
Right-of-use assets obtained in exchange for operating lease liabilities 512 2,366
Landfill    
Adjustments to reconcile net income to net cash provided by operating activities:    
Operating lease right-of-use assets expense $ 1,604 $ 1,673