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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
OPERATING ACTIVITIES |  |  |
Net income | $ 664,505 | $ 504,893 | $ 513,384
Adjustments to reconcile net income to net cash provided by operating activities: |  |  |
Depreciation and amortization | 96,729 | 92,977 | 74,669
Provision for doubtful accounts | 15,634 | 13,489 | 5,136
Stock-based compensation | 87,791 | 41,805 | 37,565
Deferred income taxes | (15,315) | (28,096) | 15,009
Excess tax benefit on stock-based compensation | (10,388) | (13,657) |
Excess tax benefit on stock-based compensation |  |  | (18,462)
Other operating activities | 1,815 | 4,491 | 1,907
Changes in operating elements, net of effects of acquisitions: |  |  |
Receivables | (190,048) | (364,181) | (173,211)
Contract assets | (11,871) | 0 | 0
Prepaid expenses and other | 16,029 | (9,173) | (6,378)
Other non-current assets | 1,370 | (19,099) | (3,934)
Accounts payable and outstanding checks | 36,083 | 144,041 | 115,917
Accrued compensation | 47,011 | 7,209 | (47,570)
Accrued transportation expense | 25,175 | 0 | 0
Accrued income taxes | 21,176 | 18,817 | 19,921
Other accrued liabilities | 7,200 | (9,515) | (4,545)
Net cash provided by operating activities | 792,896 | 384,001 | 529,408
INVESTING ACTIVITIES |  |  |
Purchases of property and equipment | (45,000) | (40,122) | (73,452)
Purchases and development of software | (18,871) | (17,823) | (17,985)
Acquisitions, net of cash acquired | (5,315) | (49,068) | (220,203)
Other investing activities | (3,622) | (521) | (1,348)
Net cash used for investing activities | (72,808) | (107,534) | (312,988)
FINANCING ACTIVITIES |  |  |
Proceeds from stock issued for employee benefit plans | 51,285 | 38,130 | 19,271
Stock tendered for payment of withholding taxes | (21,264) | (21,557) | (36,678)
Repurchase of common stock | (300,991) | (185,485) | (172,925)
Cash dividends | (265,219) | (258,222) | (245,430)
Excess tax benefit on stock-based compensation | 0 | 0 | 18,462
Proceeds from long-term borrowings | 591,012 | 250,000 | 0
Proceeds from short-term borrowings | 2,674,000 | 8,784,000 | 6,600,000
Payments on short-term borrowings | (3,384,000) | (8,809,000) | (6,310,000)
Net cash used for financing activities | (655,177) | (202,134) | (127,300)
Effect of exchange rates on cash | (20,186) | 11,891 | (9,683)
Net change in cash and cash equivalents | 44,725 | 86,224 | 79,437
Cash and cash equivalents, beginning of year | 333,890 | 247,666 | 168,229
Cash and cash equivalents, end of year | 378,615 | 333,890 | 247,666
Supplemental cash flow disclosures |  |  |
Cash paid for income taxes | 215,644 | 262,861 | 269,187
Cash paid for interest | 47,544 | 37,871 | 28,908
Accrued share repurchases held in other accrued liabilities | $ 3,000 | $ 500 | $ 5,988

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- Definition The cash outflow associated with the development, modification or acquisition of software programs or applications for internal use (that is, not to be sold, leased or otherwise marketed to others) that qualify for capitalization. + 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=109223946&loc=d3e3213-108585 + Details
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- Definition Cash outflow in the form of capital distributions and dividends to common shareholders, preferred shareholders and noncontrolling interests. + 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=109223946&loc=d3e3291-108585 + Details
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- Definition Amount of cash outflow to satisfy an employee's income tax withholding obligation as part of a net-share settlement of a share-based award. + 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=109223946&loc=d3e3291-108585 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 25 -Paragraph 19A -URI http://asc.fasb.org/extlink&oid=107668666&loc=SL79513924-113897 + 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=109223946&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=109223946&loc=d3e3213-108585 + Details
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- Definition The cash inflow from a debt initially having maturity due after one year or beyond the operating cycle, if longer. + 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=109223946&loc=d3e3255-108585 + Details
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- Definition The cash inflow from a borrowing having initial term of repayment within one year or the normal operating cycle, if longer. + 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=109223946&loc=d3e3255-108585 + Details
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- Definition The cash inflow associated with the amount received from the stock plan 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 14 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3255-108585 + Details
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- Definition Amount of expense related to write-down of receivables to the amount expected to be collected. Includes, but is not limited to, accounts receivable and notes receivable. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.5) -URI http://asc.fasb.org/extlink&oid=115205541&loc=SL114868664-224227 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=82913815&loc=SL49130534-203044 + Details
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- Definition The cash outflow for a borrowing having initial term of repayment within one year or the normal operating cycle, if longer. + 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=109223946&loc=d3e3291-108585 + Details
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- Definition The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method. + 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 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3602-108585 + Details
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