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UNAUDITED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands | 6 Months Ended
--- | ---
Jun. 30, 2020 | Jun. 30, 2019
Cash flows from operating activities: |  |
Net income | $ 40,595 | $ 37,220
Adjustments to reconcile net income to net cash from operating activities: |  |
Depreciation and amortization | 147,027 | 149,572
Allowance for doubtful accounts | 9,006 | (2,233)
Amortization of deferred financing costs and debt discount | 1,787 | 2,000
Accretion of environmental liabilities | 5,327 | 5,134
Changes in environmental liability estimates | 5,607 | (748)
Deferred income taxes | 0 | (1,636)
Other expense (income), net | 2,865 | (2,419)
Stock-based compensation | 6,077 | 9,643
Loss on sale of businesses | 3,258 | 0
Environmental expenditures | (6,104) | (6,134)
Changes in assets and liabilities, net of acquisitions: |  |
Accounts receivable and unbilled accounts receivable | 67,540 | (13,284)
Inventories and supplies | (9,024) | (4,129)
Other current and non-current assets | (25,840) | (10,706)
Accounts payable | (82,134) | (20,915)
Other current and long-term liabilities | 7,499 | (2,895)
Net cash from operating activities | 173,486 | 138,470
Cash flows used in investing activities: |  |
Additions to property, plant and equipment | (125,721) | (118,372)
Proceeds from sale and disposal of fixed assets | 3,101 | 7,389
Acquisitions, net of cash acquired | (8,877) | (29,479)
Proceeds from sale of businesses, net of transactional costs | 7,753 | 0
Additions to intangible assets including costs to obtain or renew permits | (1,242) | (1,923)
Proceeds from sale of available-for-sale securities | 28,851 | 26,518
Purchases of available-for-sale securities | (45,550) | (24,001)
Net cash used in investing activities | (141,685) | (139,868)
Cash flows from (used in) financing activities: |  |
Change in uncashed checks | (1,689) | (3,514)
Tax payments related to withholdings on vested restricted stock | (3,395) | (4,980)
Repurchases of common stock | (17,341) | (11,272)
Payments on finance leases | (1,790) | (259)
Principal payments on debt | (3,768) | (3,768)
Borrowing from revolving credit facility | 150,000 | 0
Payment on revolving credit facility | (75,000) | 0
Net cash from (used in) financing activities | 47,017 | (23,793)
Effect of exchange rate change on cash | (3,443) | 3,139
Increase (decrease) in cash and cash equivalents | 75,375 | (22,052)
Cash and cash equivalents, beginning of period | 371,991 | 226,507
Cash and cash equivalents, end of period | 447,366 | 204,455
Cash payments for interest and income taxes: |  |
Interest paid | 38,327 | 39,369
Income taxes paid | 1,478 | 12,697
Non-cash investing activities: |  |
Property, plant and equipment accrued | 7,421 | 14,103
ROU assets obtained in exchange for operating lease liabilities | 16,216 | 5,575
ROU assets obtained in exchange for finance lease liabilities | $ 16,452 | $ 23,027

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