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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
OPERATING ACTIVITIES |  |  |
Net income | $ 504,893 | $ 513,384 | $ 509,699
Adjustments to reconcile net income to net cash provided by operating activities: |  |  |
Depreciation and amortization | 92,977 | 74,669 | 66,409
Provision for doubtful accounts | 13,489 | 5,136 | 11,538
Stock-based compensation | 41,805 | 37,565 | 57,661
Deferred income taxes | (28,096) | 15,009 | (17,095)
Excess tax benefit on stock-based compensation | (13,657) | (18,462) | (8,548)
Other | 4,491 | 1,907 | 7,409
Changes in operating elements, net of effects of acquisitions: |  |  |
Receivables | (364,181) | (173,211) | 107,560
Prepaid expenses and other | (9,173) | (6,378) | (228)
Other non-current assets | (19,099) | (3,934) | 741
Accounts payable and outstanding checks | 144,041 | 115,917 | (53,272)
Accrued compensation | 7,209 | (47,570) | 18,580
Accrued income taxes | 18,817 | 19,921 | 13,726
Other accrued liabilities | (9,515) | (4,545) | 4,156
Net cash provided by operating activities | 384,001 | 529,408 | 718,336
INVESTING ACTIVITIES |  |  |
Purchases of property and equipment | (40,122) | (73,452) | (28,115)
Purchases and development of software | (17,823) | (17,985) | (16,527)
Acquisitions, net of cash acquired | (49,068) | (220,203) | (369,833)
Restricted cash | 0 | 0 | 359,388
Other | (521) | (1,348) | 641
Net cash used for investing activities | (107,534) | (312,988) | (54,446)
FINANCING ACTIVITIES |  |  |
Proceeds from stock issued for employee benefit plans | 38,130 | 19,271 | 15,557
Stock tendered for payment of withholding taxes | (21,557) | (36,678) | (11,368)
Repurchase of common stock | (185,485) | (172,925) | (229,863)
Cash dividends | (258,222) | (245,430) | (235,615)
Excess tax benefit on stock-based compensation | 0 | 18,462 | 8,548
Proceeds from long-term borrowings | 250,000 | 0 | 0
Proceeds from short-term borrowings | 8,784,000 | 6,600,000 | 6,833,000
Payments on short-term borrowings | (8,809,000) | (6,310,000) | (6,988,000)
Net cash used for financing activities | (202,134) | (127,300) | (607,741)
Effect of exchange rates on cash | 11,891 | (9,683) | (16,860)
Net change in cash and cash equivalents | 86,224 | 79,437 | 39,289
Cash and cash equivalents, beginning of year | 247,666 | 168,229 | 128,940
Cash and cash equivalents, end of year | 333,890 | 247,666 | 168,229
Supplemental cash flow disclosures |  |  |
Cash paid for income taxes | 262,861 | 269,187 | 311,800
Cash paid for interest | 37,871 | 28,908 | 28,537
Accrued share repurchases held in other accrued liabilities | $ 500 | $ 5,988 | $ 2,250

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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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=98514028&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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=98514028&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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=98514028&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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=98514028&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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=98514028&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://www.xbrl.org/2003/role/presentationRef -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 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.5) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=82913847&loc=SL49130543-203045 + 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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=98514028&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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585 + Details
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- References No definition available. + Details
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