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Consolidated Statements of Cash Flows - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Cash Flows from Operating Activities |  |  |
Net income | $ 54,959 | $ 68,938 | $ 61,400
Adjustments to reconcile net income to net cash provided by operating activities: |  |  |
Bad debt expense | 4,062 | 624 | 2,480
Deferred income taxes | (1,865) | (123) | 5,100
Non-cash equity compensation | 17,555 | 15,818 | 11,506
Depreciation and amortization | 33,748 | 28,182 | 27,206
Non-cash lease expense | (2,307) | (1,247) | 523
Facilities consolidation reserve | (288) | (274) | (260)
Remeasurement of contingent acquisition liability |  |  | 505
Amortization of debt issuance costs | 710 | 507 | 510
Impairment of long-lived assets | 3,090 | 1,728 |
Other adjustments, net | 964 | 181 | 449
Changes in operating assets and liabilities, net of the effect of acquisitions: |  |  |
Net contract assets and liabilities | 6,064 | (11,963) | (14,148)
Contract receivables | 54,384 | (31,300) | (60,096)
Prepaid expenses and other assets | (5,410) | 1,997 | (6,650)
Accounts payable | (51,177) | 31,949 | 28,309
Accrued salaries and benefits | 26,810 | 8,012 | (2,159)
Accrued subcontractors and other direct costs | 32,544 | (12,293) | 10,762
Accrued expenses and other current liabilities | (18,198) | (4,951) | 11,120
Income tax receivable and payable | 5,375 | (4,489) | (2,063)
Other liabilities | 12,125 | 144 | 176
Net Cash Provided by Operating Activities | 173,145 | 91,440 | 74,670
Cash Flows from Investing Activities |  |  |
Capital expenditures for property and equipment and capitalized software | (17,683) | (26,901) | (21,812)
Payments for business acquisitions, net of cash acquired | (253,265) | (3,569) | (34,575)
Net Cash Used in Investing Activities | (270,948) | (30,470) | (56,387)
Cash Flows from Financing Activities |  |  |
Advances from working capital facilities | 1,020,451 | 686,830 | 573,991
Payments on working capital facilities | (870,114) | (721,809) | (579,817)
Payments on capital expenditure obligations | (1,712) | (1,621) | (3,726)
Receipt of restricted contract funds | 65,694 |  |
Payment of restricted contract funds | (106) |  |
Debt issue costs | (2,094) |  | (21)
Proceeds from exercise of options | 37 | 2,914 | 5,842
Dividends paid | (10,551) | (10,540) | (7,915)
Net payments for stockholder issuances and buybacks | (29,726) | (23,414) | (17,125)
Payments on business acquisition liabilities | 1,924 |  |
Net Cash Provided by (Used in) Financing Activities | 169,955 | (67,640) | (28,771)
Effect of Exchange Rate Changes on Cash, Cash Equivalents, and Restricted Cash | 3,353 | 166 | (792)
Increase (Decrease) in Cash, Cash Equivalents, and Restricted Cash | 75,505 | (6,504) | (11,280)
Cash, Cash Equivalents, and Restricted Cash, Beginning of Period | 6,482 | 12,986 | 24,266
Cash, Cash Equivalents, and Restricted Cash, End of Period | 81,987 | 6,482 | 12,986
Supplemental disclosure of cash flow information: |  |  |
Interest | 14,337 | 10,424 | 9,893
Income taxes | 15,954 | $ 26,595 | 14,870
Non-cash investing and financing transactions: |  |  |
Deferred and contingent consideration arising from businesses acquired |  |  | 8,391
Capital expenditure obligations |  |  | $ 6,121
Tenant improvements funded by lessor | 3,124 |  |
Exercise of options receivable from shareholders | $ 2,615 |  |

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- Definition The total amount of [all] liabilities that an Entity assumes in acquiring a business or in consideration for an asset received in a noncash (or part noncash) acquisition. Noncash is defined as transactions during a period that affect recognized assets or liabilities but that do not result in cash receipts or cash payments in the period. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or cash payments in the period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=121583591&loc=d3e4313-108586 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=121583591&loc=d3e4304-108586 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=121583591&loc=d3e4332-108586 + Details
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- Definition Amount of income (expense) included in net income that results in no cash inflow (outflow), classified as other. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3602-108585 + Details
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- Definition The cash outflow to reacquire common and preferred stock. + 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=121586364&loc=d3e3291-108585 + Details
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- Definition The cash outflow paid to third parties in connection with debt origination, which will be amortized over the remaining maturity period of the associated long-term debt. + 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 (e) -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3291-108585 + Details
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- Definition Amount of cash outflow in the form of ordinary dividends to common shareholders of the parent entity. + 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=121586364&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=121586364&loc=d3e3213-108585 + Details
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- Definition The cash outflow for purchases of and capital improvements on 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 13 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3213-108585 + Details
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- Definition The cash inflow from bank borrowing during the year. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121586364&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 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08(g)(1)(ii)) -URI http://asc.fasb.org/extlink&oid=120395691&loc=d3e23780-122690 Reference 2: 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=121641772&loc=SL7669619-108580 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=109222650&loc=SL51721683-107760 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting 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