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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Cash Flows from Operating Activities:      
Net loss $ (21,799) $ (6,858) $ (11,781)
Adjustments to reconcile net loss to net cash provided by operating activities:      
Depreciation and amortization 62,102 61,856 62,704
Depletion of landfill operating lease obligations 9,646 9,295 9,428
Interest accretion on landfill and environmental remediation liabilities 4,482 3,606 3,449
Amortization of debt issuance costs and discounts on long-term debt 2,692 3,881 3,977
Stock-based compensation 6,432 3,393 3,079
Environmental remediation charge 0 900  
Loss (gain) on sale of property and equipment 49 (574) 0
Southbridge Landfill non-cash closure charge 63,526 0 0
Divestiture transactions 0 0 (5,517)
Loss on debt extinguishment 517 13,747 999
Loss on derivative instruments 0 0 227
Impairment of investments 0 0 2,099
Excess tax benefit on the vesting of share based awards 0 0 (185)
Deferred income taxes (15,525) 583 795
Changes in assets and liabilities, net of effects of acquisitions and divestitures:      
Accounts receivable (4,664) (1,029) (4,419)
Accounts payable 2,084 76 (3,597)
Prepaid expenses, inventories and other assets (1,404) (2,256) 5,240
Accrued expenses and other liabilities (600) (6,186) 4,140
Net cash provided by operating activities 107,538 80,434 70,507
Cash Flows from Investing Activities:      
Acquisitions, net of cash acquired (5,056) (2,839) 0
Acquisition related additions to property, plant and equipment (469) (38) 0
Additions to property, plant and equipment (64,393) (54,200) (49,995)
Payments on landfill operating lease contracts (7,240) (7,249) (5,385)
Proceeds from divestiture transactions 0 0 5,335
Proceeds from sale of property and equipment 711 1,362 715
Proceeds from property insurance settlement 0 0 546
Net cash used in investing activities (76,447) (62,964) (48,784)
Cash Flows from Financing Activities:      
Proceeds from long-term borrowings 185,500 604,850 355,229
Principal payments on long-term debt (216,966) (608,198) (370,996)
Change in restricted cash 0 1,347 4,471
Payments of debt issuance costs (1,452) (8,146) (9,025)
Payments of debt extinguishment costs 0 (7,219) (146)
Proceeds from the exercise of share based awards 1,278 128 161
Excess tax benefit on the vesting of share based awards 0 0 185
Distribution to noncontrolling interest holders 0 0 (1,495)
Net cash used in financing activities (31,640) (17,238) (21,616)
Net (decrease) increase in cash and cash equivalents (549) 232 107
Cash and cash equivalents, beginning of period 2,544 2,312 2,205
Cash and cash equivalents, end of period 1,995 2,544 2,312
Supplemental Disclosures of Cash Flow Information:      
Interest 25,029 42,712 35,232
Income taxes, net of refunds 146 274 282
Supplemental Disclosures of Non-Cash Investing and Financing Activities:      
Non-current assets acquired through long-term obligations $ 3,564 $ 2,299 $ 3,264