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UNAUDITED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2021 | Mar. 31, 2020
Cash flows from operating activities: |  |
Net income | $ 21,736 | $ 11,572
Adjustments to reconcile net income to net cash from operating activities: |  |
Depreciation and amortization | 72,163 | 74,533
Allowance for doubtful accounts | 2,446 | 4,700
Amortization of deferred financing costs and debt discount | 900 | 891
Accretion of environmental liabilities | 2,953 | 2,561
Changes in environmental liability estimates | 275 | 3,470
Deferred income taxes | (39) | 0
Other expense, net | 1,228 | 2,365
Stock-based compensation | 3,480 | 3,291
Loss on sale of businesses | 0 | 3,074
Environmental expenditures | (3,011) | (3,435)
Changes in assets and liabilities, net of acquisitions: |  |
Accounts receivable and unbilled accounts receivable | (9,703) | (24,960)
Inventories and supplies | (747) | (7,024)
Other current and non-current assets | (9,956) | 8,714
Accounts payable | 22,179 | (5,169)
Other current and long-term liabilities | (904) | (40,902)
Net cash from operating activities | 103,000 | 33,681
Cash flows used in investing activities: |  |
Additions to property, plant and equipment | (41,913) | (82,767)
Proceeds from sale and disposal of fixed assets | 1,204 | 2,150
Acquisitions, net of cash acquired | (22,918) | 0
Proceeds from sale of businesses, net of transactional costs | 0 | 7,856
Additions to intangible assets including costs to obtain or renew permits | (505) | (448)
Proceeds from sale of available-for-sale securities | 20,375 | 12,180
Purchases of available-for-sale securities | (42,980) | (32,058)
Net cash used in investing activities | (86,737) | (93,087)
Cash flows (used in) from financing activities: |  |
Change in uncashed checks | (6,662) | (1,775)
Tax payments related to withholdings on vested restricted stock | (3,719) | (2,224)
Repurchases of common stock | (26,546) | (17,341)
Deferred financing costs paid | (137) | 0
Payments on finance leases | (1,672) | (329)
Principal payments on debt | (1,884) | (1,884)
Borrowings from revolving credit facility | 0 | 150,000
Net cash (used in) from financing activities | (40,620) | 126,447
Effect of exchange rate change on cash | 1,639 | (6,827)
(Decrease) increase in cash and cash equivalents | (22,718) | 60,214
Cash and cash equivalents, beginning of period | 519,101 | 371,991
Cash and cash equivalents, end of period | 496,383 | 432,205
Cash payments for interest and income taxes: |  |
Interest paid | 27,507 | 30,648
Income taxes paid, net of refunds | 3,599 | 971
Non-cash investing activities: |  |
Property, plant and equipment accrued | 5,108 | 12,173
ROU assets obtained in exchange for operating lease liabilities | 2,305 | 12,410
ROU assets obtained in exchange for finance lease liabilities | $ 9,205 | $ (856)

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