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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands | 6 Months Ended
--- | ---
Jun. 30, 2018 | Jun. 30, 2017
OPERATING ACTIVITIES |  |
Net income | $ 301,460 | $ 233,151
Adjustments to reconcile net income to net cash provided by operating activities: |  |
Depreciation and amortization | 48,479 | 45,377
Provision for doubtful accounts | 9,055 | 7,669
Stock-based compensation | 44,704 | 16,842
Deferred income taxes | (9,014) | (4,988)
Excess tax benefit on stock-based compensation | (7,502) | (10,583)
Loss on disposal of assets | 668 | 536
Changes in operating elements (net of acquisitions): |  |
Receivables | (214,620) | (244,682)
Contract assets | (34,483) | 0
Prepaid expenses and other | 5,326 | (9,646)
Other non-current assets | 3,243 | (1,016)
Accounts payable and outstanding checks | 101,770 | 135,130
Accrued transportation expense | 45,420 | 0
Accrued compensation | (7,381) | (23,353)
Accrued income taxes | 12,068 | 10,185
Other accrued liabilities | 9,277 | (4,611)
Net cash provided by operating activities | 308,470 | 150,011
INVESTING ACTIVITIES |  |
Purchases of property and equipment | (20,569) | (24,105)
Purchases and development of software | (9,514) | (8,865)
Acquisitions, net of cash acquired | (1,315) | (1,780)
Other | (1,546) | (1,095)
Net cash used for investing activities | (32,944) | (35,845)
FINANCING ACTIVITIES |  |
Proceeds from stock issued for employee benefit plans | 35,846 | 19,814
Stock tendered for payment of withholding taxes | (18,893) | (19,626)
Repurchase of common stock | (119,497) | (70,494)
Cash dividends | (130,559) | (128,806)
Proceeds from long-term borrowings | 591,012 | 250,000
Proceeds from short-term borrowings | 2,418,000 | 4,282,000
Payments on short-term borrowings | (3,067,000) | (4,430,000)
Net cash used for financing activities | (291,091) | (97,112)
Effect of exchange rates on cash | (7,750) | 8,462
Net change in cash and cash equivalents | (23,315) | 25,516
Cash and cash equivalents, beginning of period | 333,890 | 247,666
Cash and cash equivalents, end of period | 310,575 | 273,182
Noncash transactions from investing and financing activities: |  |
Accrued share repurchases held in other accrued liabilities | 2,400 | 0
Accrued purchases of property and equipment | $ 1,677 | $ 1,500

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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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