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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Cash Flows from Operating Activities:      
Net income (loss) $ 6,420 $ (21,799) $ (6,858)
net income (loss) to net cash provided by operating activities:      
Depreciation and amortization 70,508 62,102 61,856
Depletion of landfill operating lease obligations 9,724 9,646 9,295
Interest accretion on landfill and environmental remediation liabilities 5,708 4,482 3,606
Amortization of debt issuance costs and discounts on long-term debt 2,449 2,692 3,881
Stock-based compensation 8,445 6,432 3,393
Environmental remediation charge 0 0 900
(Gain) loss on sale of property and equipment (492) 49 (574)
Southbridge Landfill non-cash closure charge 16,179 63,526 0
Southbridge Landfill insurance recovery for investing activities (3,506) 0 0
Non-cash expense from acquisition activities and other items 757 0 0
Development project charge 311 0 0
Loss on debt extinguishment 7,352 517 13,747
Impairment of investments 1,069 0 0
Deferred income taxes 1,250 (15,525) 583
Changes in assets and liabilities, net of effects of acquisitions and divestitures:      
Accounts receivable (5,833) (4,664) (1,029)
Accounts payable 9,091 2,084 76
Prepaid expenses, inventories and other assets 535 (1,404) (2,256)
Accrued expenses and other liabilities (9,133) (600) (6,186)
Net cash provided by operating activities 120,834 107,538 80,434
Cash Flows from Investing Activities:      
Acquisitions, net of cash acquired (88,918) (5,056) (2,839)
Additions to property, plant and equipment (73,232) (64,862) (54,238)
Payments on landfill operating lease contracts (7,415) (7,240) (7,249)
Proceeds from property insurance settlement 992 0 0
Proceeds from sale of property and equipment 870 711 1,362
Net cash used in investing activities (164,197) (76,447) (62,964)
Cash Flows from Financing Activities:      
Proceeds from long-term borrowings 634,700 185,500 604,850
Principal payments on long-term debt (584,223) (216,966) (608,198)
Payments of debt issuance costs (5,573) (1,452) (8,146)
Payments of debt extinguishment costs 0 0 (7,219)
Proceeds from the exercise of share based awards 471 1,278 128
Net cash provided by (used in) financing activities 45,375 (31,640) (18,585)
Net increase (decrease) in cash, cash equivalents and restricted cash 2,012 (549) (1,115)
Cash, cash equivalents and restricted cash, beginning of period 1,995 2,544 3,659
Cash, cash equivalents and restricted cash, end of period 4,007 1,995 2,544
Supplemental Disclosures of Cash Flow Information:      
Interest 23,523 25,029 42,712
Income taxes, net of refunds 105 146 274
Supplemental Disclosures of Non-Cash Investing and Financing Activities:      
Non-current assets acquired through long-term obligations 7,092 3,564 $ 2,299
Southbridge Landfill      
net income (loss) to net cash provided by operating activities:      
Southbridge Landfill non-cash closure charge 6,012 0  
Development project charge 0 $ 9,149  
Cash Flows from Investing Activities:      
Proceeds from property insurance settlement $ 3,506