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UNAUDITED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands | 6 Months Ended
--- | ---
Jun. 30, 2019 | Jun. 30, 2018
Cash flows from operating activities: |  |
Net income | $ 37,220 | $ 18,116
Adjustments to reconcile net income to net cash from operating activities: |  |
Depreciation and amortization | 149,572 | 147,604
Allowance for doubtful accounts | (2,233) | 7,389
Amortization of deferred financing costs and debt discount | 2,000 | 1,881
Accretion of environmental liabilities | 5,134 | 4,878
Changes in environmental liability estimates | (748) | (673)
Deferred income taxes | (1,636) | (10)
Other income, net | (2,419) | (547)
Stock-based compensation | 9,643 | 6,639
Environmental expenditures | (6,134) | (4,585)
Changes in assets and liabilities, net of acquisitions |  |
Accounts receivable and unbilled accounts receivable | (13,284) | (62,764)
Inventories and supplies | (4,129) | (18,625)
Other current and non-current assets | (10,706) | 180
Accounts payable | (20,915) | 23,605
Other current and long-term liabilities | (2,895) | 6,582
Net cash from operating activities | 138,470 | 129,670
Cash flows used in investing activities: |  |
Additions to property, plant and equipment | (118,372) | (94,139)
Proceeds from sale and disposal of fixed assets | 7,389 | 2,641
Acquisitions, net of cash acquired | (29,479) | (123,750)
Additions to intangible assets including costs to obtain or renew permits | (1,923) | (2,106)
Proceeds from sale of available-for-sale securities | 26,518 | 11,214
Purchases of available-for-sale securities | (24,001) | (10,001)
Net cash used in investing activities | (139,868) | (216,141)
Inventories and supplies |  |
Change in uncashed checks | (3,514) | (2,803)
Tax payments related to withholdings on vested restricted stock | (4,980) | (2,175)
Repurchases of common stock | (11,272) | (26,482)
Deferred financing costs paid | 0 | (468)
Payments on finance lease | (259) | 0
Principal payments on debt | (3,768) | (2,000)
Net cash used in financing activities | (23,793) | (33,928)
Effect of exchange rate change on cash | 3,139 | (1,932)
Decrease in cash and cash equivalents | (22,052) | (122,331)
Cash and cash equivalents, beginning of period | 226,507 | 319,399
Cash and cash equivalents, end of period | 204,455 | 197,068
Cash payments for interest and income taxes: |  |
Interest paid | 39,369 | 40,745
Income taxes paid | 12,697 | 14,118
Cash paid for amounts included in the measurement of lease liabilities: |  |
Operating cash flows from operating leases | 27,773 |
Operating cash flows from finance lease | 612 |
Financing cash flows from finance lease | 259 | 0
Non-cash investing activities: |  |
Property, plant and equipment accrued | 14,103 | $ 13,041
ROU assets obtained in exchange for new operating lease liabilities | 5,575 |
ROU asset obtained in exchange for new finance lease liability | $ 23,027 |

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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=118932676&loc=d3e3291-108585 + Details
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- Definition The cash outflow for loan and debt issuance costs. + 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 -URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3291-108585 + Details
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- Definition Amount of cash outflow to satisfy grantee's tax withholding obligation for award under share-based payment arrangement. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3291-108585 + Details
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- Definition The cash outflow associated with the acquisition of a business, net of the cash acquired from the purchase. + 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 (b) -URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3213-108585 + Details
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- Definition The cash inflow from the sale of property, plant and equipment (capital expenditures), software, and other intangible assets. + 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 (c) -URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3179-108585 + Details
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