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Consolidated Statements of Cash Flows - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
CASH FLOWS FROM OPERATING ACTIVITIES: |  |  |
Net income | $ 290,584 | $ 343,389 | $ 357,796
Adjustments to reconcile net income to net cash provided by operating activities: |  |  |
Amortization of intangible assets | 1,563 | 1,237 | 192
Depreciation expense | 63,930 | 63,078 | 53,273
Stock-based compensation expense—restricted stock and stock units | 42,191 | 42,699 | 41,292
Excess tax benefits from stock-based compensation | 0 | (1,822) | (8,762)
Deferred income taxes | 44,091 | (1,868) | (8,579)
Provision for doubtful accounts | 8,022 | 9,192 | 12,005
Changes in assets and liabilities, net of effects of acquisitions: |  |  |
Increase in accounts receivable | (17,039) | (15,888) | (75,745)
Increase in accounts payable, accrued expenses, accrued payroll and benefit costs | 47,832 | 19,726 | 60,232
(Decrease) increase in income taxes payable, net | (9,655) | (8,246) | 19,948
Change in other assets, net of change in other liabilities | (18,528) | (9,416) | (13,416)
Net cash flows provided by operating activities | 452,991 | 442,081 | 438,236
CASH FLOWS FROM INVESTING ACTIVITIES: |  |  |
Payments for acquisitions, net of cash acquired | (1,160) | (2,200) | (14,668)
Capital expenditures | (40,753) | (82,956) | (75,057)
Payments to trusts for employee deferred compensation plans | (36,584) | (27,079) | (28,225)
Net cash flows used in investing activities | (78,497) | (112,235) | (117,950)
CASH FLOWS FROM FINANCING ACTIVITIES: |  |  |
Repurchases of common stock | (231,724) | (176,031) | (271,138)
Cash dividends paid | (121,000) | (114,164) | (107,561)
Decrease in notes payable and other indebtedness | (167) | (154) | (140)
Excess tax benefits from stock-based compensation | 0 | 1,822 | 8,762
Proceeds from exercises of stock options | 0 | 223 | 1,529
Net cash flows used in financing activities | (352,891) | (288,304) | (368,548)
Effect of exchange rate changes on cash and cash equivalents | 12,949 | (5,918) | (14,280)
Net increase (decrease) in cash and cash equivalents | 34,552 | 35,624 | (62,542)
Cash and cash equivalents at beginning of period | 260,201 | 224,577 | 287,119
Cash and cash equivalents at end of period | 294,753 | 260,201 | 224,577
Cash paid during the year for: |  |  |
Interest | 278 | 266 | 285
Income taxes, net of refunds | 190,954 | 219,415 | 212,668
Non-cash items: |  |  |
Stock repurchases awaiting settlement | $ 0 | $ 14,688 | $ 11,935

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