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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) | $ 65,636 | $ 100,739 | $ (39,873)
Adjustments to reconcile net income (loss) to net cash from operating activities: |  |  |
Depreciation and amortization | 298,625 | 288,422 | 287,002
Goodwill impairment charge | 0 | 0 | 34,013
Allowance for doubtful accounts | 15,817 | 7,901 | 6,907
Amortization of deferred financing costs and debt discount | 3,846 | 3,482 | 3,537
Accretion of environmental liabilities | 9,806 | 9,460 | 10,177
Changes in environmental liability estimates | 2,147 | (195) | (4,254)
Deferred income taxes | 19,089 | (83,335) | 15,184
Other expense (income), net | 4,510 | 6,119 | (5,685)
Stock-based compensation | 16,792 | 13,146 | 10,481
Excess tax benefit of stock-based compensation | 0 | 0 | (1,198)
Net tax benefit on stock-based awards | 0 | 0 | 1,165
Gain on sale of businesses | 0 | (30,732) | (16,884)
Loss on early extinguishment of debt | 2,488 | 7,891 | 0
Environmental expenditures | (10,115) | (12,965) | (12,170)
Changes in assets and liabilities, net of acquisitions: |  |  |
Accounts receivable and unbilled accounts receivable | (79,563) | (33,764) | (15,009)
Inventories and supplies | (26,958) | (5,002) | (16,080)
Other current assets | (7,946) | 16,720 | (8,036)
Accounts payable | 46,915 | (10,684) | (3,503)
Other current and long-term liabilities | 12,121 | 8,495 | 13,850
Net cash from operating activities | 373,210 | 285,698 | 259,624
Cash flows used in investing activities: |  |  |
Additions to property, plant and equipment | (193,344) | (167,007) | (219,384)
Proceeds from sale and disposal of fixed assets | 15,445 | 7,124 | 20,817
Acquisitions, net of cash acquired | (151,023) | (49,227) | (206,915)
Additions to intangible assets including costs to obtain or renew permits | (4,688) | (1,617) | (2,831)
Purchases of available-for-sale securities | (44,772) | (38,342) | (598)
Proceeds from sale of available-for-sale securities | 28,723 | 376 | 0
Proceeds from sale of businesses, net of transactional costs | 0 | 45,426 | 47,134
Net cash used in investing activities | (349,659) | (203,267) | (361,777)
Cash flows (used in) from financing activities: |  |  |
Change in uncashed checks | 132 | (5,940) | (3,177)
Proceeds from exercise of stock options | 0 | 46 | 627
Tax payments related to withholdings on vested restricted stock | (3,266) | (3,149) | (2,819)
Repurchases of common stock | (45,080) | (48,971) | (22,188)
Excess tax benefit of stock-based compensation | 0 | 0 | 1,198
Deferred financing costs paid | (4,027) | (5,718) | (4,031)
Premiums paid on early extinguishment of debt | (1,238) | (6,028) | 0
Principal payments on debt | (405,768) | (402,000) | 0
Issuance of senior secured notes, net of discount | 348,250 | 399,000 | 0
Issuance of senior secured notes, net of discount | 0 | 0 | 250,625
Borrowing from revolving credit facility | 50,000 | 0 | 0
Payment on revolving credit facility | (50,000) | 0 | 0
Net cash (used in) from financing activities | (110,997) | (72,760) | 220,235
Effect of exchange rate change on cash | (5,446) | 2,731 | 4,207
(Decrease) increase in cash and cash equivalents | (92,892) | 12,402 | 122,289
Cash and cash equivalents, beginning of year | 319,399 | 306,997 | 184,708
Cash and cash equivalents, end of year | 226,507 | 319,399 | 306,997
Cash payments for interest and income taxes: |  |  |
Interest paid | 89,171 | 93,174 | 88,669
Income taxes paid | 20,036 | 18,682 | 29,255
Non-cash investing activities: |  |  |
Property, plant and equipment accrued | 15,657 | 16,109 | 9,214
Transfer of inventory to property, plant and equipment | 0 | 12,641 | 0
(Payable) receivable for estimated purchase price adjustment | $ (4,032) | $ 0 | $ 1,910

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- Definition Amount of cash inflow (outflow) from operating activities, including discontinued operations. Operating activity cash flows include transactions, adjustments, and changes in value not defined as investing or financing activities. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 25 -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3536-108585 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 24 -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3521-108585 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3602-108585 + Details
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- Definition The portion of profit or loss for the period, net of income taxes, which is attributable to the parent. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 1A -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=114867106&loc=SL7669619-108580 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 220 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04(22)) -URI http://asc.fasb.org/extlink&oid=114873765&loc=SL114874048-224260 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 1B -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=114867106&loc=SL7669625-108580 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 220 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04(18)) -URI http://asc.fasb.org/extlink&oid=114873790&loc=SL114874131-224263 Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03(20)) -URI http://asc.fasb.org/extlink&oid=115205541&loc=SL114868664-224227 Reference 6: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3602-108585 Reference 7: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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- Definition Other increase (decrease) not attributable to current expense nor cash payments during an accounting period in estimated obligations recorded for probable future costs attributable to environmental contamination issues. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3602-108585 + Details
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- Definition Cash outflows made during the period for environmental remediation activities. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 17 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3367-108585 + Details
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- Definition The cash outflow to reacquire common stock during the period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3291-108585 + Details
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- Definition Amount of cash outflow for cost from early extinguishment and prepayment of debt. Includes, but is not limited to, third-party cost, premium paid, and other fee paid to lender directly for debt extinguishment or debt prepayment. Excludes accrued interest. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3291-108585 + Details
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- Definition Amount of cash outflow to satisfy an employee's income tax withholding obligation as part of a net-share settlement of a share-based award. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3291-108585 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 25 -Paragraph 19A -URI http://asc.fasb.org/extlink&oid=107668666&loc=SL79513924-113897 + Details
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- Definition The cash outflow to acquire asset without physical form usually arising from contractual or other legal rights, excluding goodwill. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3213-108585 + Details
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- Definition The cash inflow associated with the amount received from the sale of a portion of the company's business, for example a segment, division, branch or other business, during the period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3179-108585 + Details
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