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UNAUDITED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands | 6 Months Ended
--- | ---
Jun. 30, 2021 | Jun. 30, 2020
Cash flows from operating activities: |  |
Net income | $ 88,811 | $ 40,595
Adjustments to reconcile net income to net cash from operating activities: |  |
Depreciation and amortization | 143,755 | 147,027
Allowance for doubtful accounts | 2,109 | 9,006
Amortization of deferred financing costs and debt discount | 1,806 | 1,787
Accretion of environmental liabilities | 5,826 | 5,327
Changes in environmental liability estimates | 445 | 5,607
Deferred income taxes | 1,912 | 0
Other expense, net | 2,708 | 2,865
Stock-based compensation | 6,785 | 6,077
Loss on sale of businesses | 0 | 3,258
Environmental expenditures | (6,594) | (6,104)
Changes in assets and liabilities, net of acquisitions: |  |
Accounts receivable and unbilled accounts receivable | (51,285) | 67,540
Inventories and supplies | 765 | (9,024)
Other current and non-current assets | (12,043) | (25,840)
Accounts payable | 49,880 | (82,134)
Other current and long-term liabilities | 30,552 | 7,499
Net cash from operating activities | 265,432 | 173,486
Cash flows used in investing activities: |  |
Additions to property, plant and equipment | (91,988) | (125,721)
Proceeds from sale and disposal of fixed assets | 3,479 | 3,101
Acquisitions, net of cash acquired | (22,918) | (8,877)
Proceeds from sale of businesses, net of transactional costs | 0 | 7,753
Additions to intangible assets including costs to obtain or renew permits | (1,750) | (1,242)
Proceeds from sale of available-for-sale securities | 70,526 | 28,851
Purchases of available-for-sale securities | (89,689) | (45,550)
Net cash used in investing activities | (132,340) | (141,685)
Cash flows (used in) from financing activities: |  |
Change in uncashed checks | (2,895) | (1,689)
Tax payments related to withholdings on vested restricted stock | (4,739) | (3,395)
Repurchases of common stock | (45,409) | (17,341)
Deferred financing costs paid | (146) | 0
Payments on finance leases | (3,577) | (1,790)
Principal payments on debt | (3,768) | (3,768)
Borrowing from revolving credit facility | 0 | 150,000
Payment on revolving credit facility | 0 | (75,000)
Net cash (used in) from financing activities | (60,534) | 47,017
Effect of exchange rate change on cash | 3,915 | (3,443)
Increase in cash and cash equivalents | 76,473 | 75,375
Cash and cash equivalents, beginning of period | 519,101 | 371,991
Cash and cash equivalents, end of period | 595,574 | 447,366
Cash payments for interest and income taxes: |  |
Interest paid | 34,164 | 38,327
Income taxes paid, net of refunds | 32,519 | 1,478
Non-cash investing activities: |  |
Property, plant and equipment accrued | 8,807 | 7,421
ROU assets obtained in exchange for operating lease liabilities | 5,774 | 16,216
ROU assets obtained in exchange for finance lease liabilities | $ 18,704 | $ 16,452

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