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Consolidated Statements of Cash Flows - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Operating activities |  |  |
Net income | $ 216,726 | $ 150,611 | $ 107,962
Adjustments to reconcile net income to net cash provided by operating activities: |  |  |
Depreciation and amortization | 30,153 | 31,536 | 31,177
Amortization and impairment of other intangible assets | 8,152 | 8,162 | 10,563
Acquisition-related contingent consideration | 2,372 | 479 | 2,291
Provision for doubtful accounts | 19,602 | 17,872 | 15,386
Share-based compensation | 17,978 | 15,577 | 16,030
Amortization of debt discount and issuance costs | 11,615 | 5,456 | 1,984
Loss on early extinguishment of debt | 0 | 9,072 | 0
Gain on sale of business | 0 | (13,031) | 0
Deferred income taxes | (3,712) | 20,831 | (51,579)
Other | 302 | 769 | 611
Changes in operating assets and liabilities, net of effects from acquisitions: |  |  |
Accounts receivable, billed and unbilled | (141,894) | (72,034) | (50,831)
Notes receivable | 10,445 | 8,987 | 14,928
Prepaid expenses and other assets | (22,648) | (2,258) | 629
Accounts payable, accrued expenses and other | (8,907) | 8,908 | 4,421
Income taxes | 24,496 | (8,890) | 25,811
Accrued compensation | 61,339 | 52,510 | 1,795
Billings in excess of services provided | (8,133) | (3,885) | 16,447
Net cash provided by operating activities | 217,886 | 230,672 | 147,625
Investing activities |  |  |
Proceeds from sale of business | 0 | 50,283 | 0
Payments for acquisition of businesses, net of cash received | (18,791) | 0 | (8,929)
Purchases of property and equipment | (42,072) | (32,270) | (32,004)
Other | 257 | 731 | 295
Net cash provided by (used in) investing activities | (60,606) | 18,744 | (40,638)
Financing activities |  |  |
Borrowings under revolving line of credit | 45,000 | 233,500 | 422,000
Repayments under revolving line of credit | (45,000) | (333,500) | (392,000)
Proceeds from issuance of convertible notes | 0 | 316,250 | 0
Payments of long-term debt | 0 | (300,000) | 0
Payments of debt issue and debt prepayment costs | 0 | (16,149) | 0
Purchase and retirement of common stock | (105,797) | (55,738) | (168,094)
Net issuance of common stock under equity compensation plans | 3,171 | 38,475 | (504)
Payments for business acquisition liabilities | (2,282) | (3,029) | (5,161)
Deposits and other | 1,597 | 2,672 | 2,825
Net cash used in financing activities | (103,311) | (117,519) | (140,934)
Effect of exchange rate changes on cash and cash equivalents | 3,335 | (9,789) | 7,750
Net increase (decrease) in cash and cash equivalents | 57,304 | 122,108 | (26,197)
Cash and cash equivalents, beginning of period | 312,069 | 189,961 | 216,158
Cash and cash equivalents, end of period | 369,373 | 312,069 | 189,961
Supplemental cash flow disclosures |  |  |
Cash paid for interest | 7,606 | 21,687 | 23,285
Cash paid for income taxes, net of refunds | 50,941 | 45,568 | 4,929
Non-cash investing and financing activities: |  |  |
Issuance of stock units under incentive compensation plans | 1,413 | 1,059 | 1,547
Business acquisition liabilities not yet paid | $ 9,746 | $ 0 | $ 3,426

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- Definition The portion of profit or loss for the period, net of income taxes, which is attributable to the parent. + 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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 220 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04(22)) -URI http://asc.fasb.org/extlink&oid=116637391&loc=SL114874048-224260 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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 220 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04(18)) -URI http://asc.fasb.org/extlink&oid=116637232&loc=SL114874131-224263 Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03(20)) -URI http://asc.fasb.org/extlink&oid=116634182&loc=SL114868664-224227 Reference 6: 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=118932676&loc=d3e3602-108585 Reference 7: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + 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=118932676&loc=d3e3602-108585 + Details
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- Definition Amount of cash outflow, not made soon after acquisition date of business combination, to settle contingent consideration liability up to amount recognized at acquisition date, including, but not limited to, measurement period adjustment and less amount paid soon after acquisition date. + 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 (f) -URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3291-108585 + Details
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- Definition The cash outflow to reacquire common stock during the period. + 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=118932676&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=118932676&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=118932676&loc=d3e3213-108585 + Details
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- Definition The cash outflow associated with the acquisition of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale; includes cash outflows to pay for construction of self-constructed 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=118932676&loc=d3e3213-108585 + Details
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- Definition The cash inflow from the issuance of a long-term debt instrument which can be exchanged for a specified amount of another security, typically the entity's common stock, at the option of the issuer or the holder. + 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=118932676&loc=d3e3255-108585 + Details
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- Definition The cash inflow associated with the amount received from the sale of a portion of the company's business, for example a segment, division, branch or other business, during the period. + 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 (b) -URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3179-108585 + Details
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- Definition Amount of cash inflow from contractual arrangement with the lender, including but not limited to, letter of credit, standby letter of credit and revolving credit arrangements. + 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=118932676&loc=d3e3255-108585 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(f)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
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