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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Cash flows from operating activities: |  |  |
Net income | $ 36,214 | $ 31,294 | $ 21,154
Adjustments to reconcile net income to net cash flows provided by (used in) operating activities: |  |  |
Depreciation and amortization of property and equipment | 40,667 | 38,070 | 38,077
Amortization of intangible assets | 3,849 | 1,843 | 499
Stock-based compensation expense | 4,403 | 3,165 | 4,376
Deferred income taxes | 3,602 | 3,649 | (5,091)
Gain on sale of property and equipment | (3,543) | (3,832) | (3,664)
Other non-cash items | 1,029 | 237 | 1,194
Changes in operating assets and liabilities, net of acquisitions: |  |  |
Accounts receivable, net | (39,710) | (15,871) | (35,944)
Contract assets | (16,443) | (28,141) | (17,857)
Receivable for insurance claims in excess of deductibles | (9,646) | (9,229) | (39)
Other assets | (10,327) | 2,280 | (2,213)
Accounts payable | 22,492 | 19,953 | 8,149
Contract liabilities | 28,163 | 22,551 | (14,317)
Accrued self-insurance | 12,755 | 8,701 | 2,765
Other liabilities | (8,606) | 10,119 | (6,287)
Net cash flows provided by (used in) operating activities | 64,899 | 84,789 | (9,198)
Cash flows from investing activities: |  |  |
Proceeds from sale of property and equipment | 4,051 | 4,583 | 4,342
Cash paid for acquisitions, net of cash acquired | (79,720) | (47,082) | 0
Purchases of property and equipment | (57,828) | (50,704) | (30,843)
Net cash flows used in investing activities | (133,497) | (93,203) | (26,501)
Cash flows from financing activities: |  |  |
Net borrowings (repayments) under revolving lines of credit | 45,514 | (20,655) | 19,890
Payment of principal obligations under equipment notes | (4,550) | 0 | 0
Payment of principal obligations under finance leases | (1,201) | (1,081) | (1,203)
Borrowings under equipment notes | 35,068 | 31,486 | 0
Proceeds from exercise of stock options | 341 | 1,897 | 1,232
Debt refinancing costs | (1,122) | 0 | 0
Repurchase of common shares | (778) | (1,043) | (3,058)
Other financing activities | 84 | 38 | 28
Net cash flows provided by financing activities | 73,356 | 10,642 | 16,889
Effect of exchange rate changes on cash | 132 | (64) | 307
Net increase (decrease) in cash and cash equivalents | 4,890 | 2,164 | (18,503)
Cash and cash equivalents: |  |  |
Beginning of period | 7,507 | 5,343 | 23,846
End of period | 12,397 | 7,507 | 5,343
Cash paid during the period for: |  |  |
Income taxes payments | 13,381 | 7,247 | 6,597
Interest payments | 5,737 | 3,097 | 2,259
Noncash investing activities: |  |  |
Acquisition of property and equipment for which payment is pending | $ 43 | $ 953 | $ 2,050

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- Definition Amount of cash inflow (outflow) from financing activities classified as other. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 3 -Subparagraph (SX 210.12-04(a)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e24072-122690 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3255-108585 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -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 The net cash inflow or cash outflow from a contractual arrangement with the lender, including letter of credit, standby letter of credit and revolving credit arrangements, under which borrowings can be made up to a specific amount at any point in time with either short term or long term maturity that is collateralized (backed by pledge, mortgage or other lien in the entity's assets). + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 3 -Subparagraph (SX 210.12-04(a)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e24072-122690 + Details
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- Definition The cash inflow from the sale of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale. + 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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- Definition Amount of cash inflow from exercise of option under share-based payment arrangement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2A -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=116856206&loc=SL79508275-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3255-108585 + Details
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- Definition The consolidated profit or loss for the period, net of income taxes, including the portion attributable to the noncontrolling interest. + 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=118930883&loc=SL7669619-108580 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 50 -Paragraph 1A -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=109239629&loc=SL4573702-111684 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=118930883&loc=SL7669625-108580 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 50 -Paragraph 1A -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=109239629&loc=SL4573702-111684 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 22 -URI http://asc.fasb.org/extlink&oid=115929826&loc=d3e8736-108599 Reference 6: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 55 -Paragraph 4J -URI http://asc.fasb.org/extlink&oid=116874947&loc=SL4591551-111686 Reference 7: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3000-108585 Reference 8: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 45 -Paragraph 19 -URI http://asc.fasb.org/extlink&oid=108774443&loc=SL4569616-111683 Reference 9: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 32 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=115929826&loc=d3e8933-108599 Reference 10: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 55 -Paragraph 4K -URI http://asc.fasb.org/extlink&oid=116874947&loc=SL4591552-111686 + Details
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- Definition The cash outflow for a borrowing supported by a written promise to pay an obligation. + 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 (b) -URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3291-108585 + Details
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