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Consolidated Statements of Cash Flows - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
CASH FLOWS FROM OPERATING ACTIVITIES: |  |  |
Net income | $ 343,389 | $ 357,796 | $ 305,928
Adjustments to reconcile net income to net cash provided by operating activities: |  |  |
Amortization of intangible assets | 1,237 | 192 | 557
Depreciation expense | 63,078 | 53,273 | 49,124
Stock-based compensation expense—restricted stock and stock units | 42,699 | 41,292 | 40,821
Excess tax benefits from stock-based compensation | (1,822) | (8,762) | (7,174)
Deferred income taxes | (1,868) | (8,579) | (3,643)
Provision for doubtful accounts | 9,192 | 12,005 | 9,825
Changes in assets and liabilities, net of effects of acquisitions: |  |  |
Increase in accounts receivable | (15,888) | (75,745) | (134,917)
Increase in accounts payable, accrued expenses, accrued payroll and benefit costs | 19,726 | 60,232 | 71,740
(Decrease) increase in income taxes payable | (8,246) | 19,948 | 16,359
Change in other assets, net of change in other liabilities | (9,416) | (13,416) | (7,922)
Net cash flows provided by operating activities | 442,081 | 438,236 | 340,698
CASH FLOWS FROM INVESTING ACTIVITIES: |  |  |
Payments for acquisitions, net of cash acquired | (2,200) | (14,668) | 0
Capital expenditures | (82,956) | (75,057) | (62,830)
Payments to trusts for employee deferred compensation plans | (27,079) | (28,225) | (25,811)
Net cash flows used in investing activities | (112,235) | (117,950) | (88,641)
CASH FLOWS FROM FINANCING ACTIVITIES: |  |  |
Repurchases of common stock | (176,031) | (271,138) | (153,821)
Cash dividends paid | (114,164) | (107,561) | (97,604)
Decrease in notes payable and other indebtedness | (154) | (140) | (128)
Excess tax benefits from stock-based compensation | 1,822 | 8,762 | 7,174
Proceeds from exercises of stock options | 223 | 1,529 | 14,324
Net cash flows used in financing activities | (288,304) | (368,548) | (230,055)
Effect of exchange rate changes on cash and cash equivalents | (5,918) | (14,280) | (10,647)
Net increase (decrease) in cash and cash equivalents | 35,624 | (62,542) | 11,355
Cash and cash equivalents at beginning of period | 224,577 | 287,119 | 275,764
Cash and cash equivalents at end of period | 260,201 | 224,577 | 287,119
Cash paid during the year for: |  |  |
Interest | 266 | 285 | 330
Income taxes, net of refunds | 219,415 | 212,668 | 178,375
Non-cash items: |  |  |
Stock repurchases awaiting settlement | $ 14,688 | $ 11,935 | $ 30,152

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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 -Glossary Investing Activities -URI http://asc.fasb.org/extlink&oid=6516133 Reference 2: 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=56944662&loc=d3e3213-108585 + Details
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- Definition The net cash inflow or outflow in aggregate debt due to repayments and proceeds from additional borrowings. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 + Details
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- Definition The cash inflow associated with the amount received from holders exercising their stock options. This item inherently excludes any excess tax benefit, which the entity may have realized and reported separately. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (j) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 2: 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=56944662&loc=d3e3255-108585 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 + 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 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.5) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 Reference 2: 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=56944662&loc=d3e3602-108585 + Details
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- Definition The noncash expense that represents the cost of restricted stock or unit distributed to employees as compensation. + 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 (b) -URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3602-108585 + Details
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