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Consolidated Statements of Cash Flows - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Net Cash Provided by (Used in) Operating Activities [Abstract] |  |  |
Net income | $ 377,047 | $ 263,269 | $ 222,054
Adjustments to reconcile net income to net cash provided by operating activities: |  |  |
Depreciation and amortization | 83,178 | 83,140 | 78,218
Amortization on marketable securities, net | (5) | 38 | 843
Impairment charge | 2,629 | 0 | 2,228
Provision for uncollectible accounts | 1,609 | 1,881 | 1,170
Benefit of (provision for) deferred income taxes | 1,209 | (7,918) | 20,881
Share-based compensation expense | 25,157 | 23,517 | 19,891
Other | 900 | 969 | 986
Tax benefit from share-based compensation arrangements | 0 | 0 | (14,702)
Changes in assets and liabilities: |  |  |
Accounts receivable | (18,401) | (24,918) | (22,554)
Inventories | (25,623) | (19,062) | 7,648
Accounts payable | (166) | 1,391 | 2,117
Deferred revenue | (7,719) | 3,551 | 7,672
Other assets and liabilities | (39,731) | 47,418 | 12,491
Net cash provided by operating activities | 400,084 | 373,276 | 338,943
Cash Flows from Investing Activities: |  |  |
Purchases of property and equipment | (115,751) | (74,384) | (64,787)
Purchases of marketable securities | (87) | (334,164) | (227,894)
Proceeds from the sale and maturities of marketable securities | 284,125 | 286,759 | 203,859
Acquisitions of intangible assets and equity investment | (7,185) | (2,320) | 0
Acquisitions of businesses, net of cash acquired | (22,500) | (14,579) | (1,964)
Net cash provided (used) by investing activities | 138,602 | (138,688) | (90,786)
Cash Flows from Financing Activities: |  |  |
(Repayment) borrowings on revolving credit facilities, net | (256,040) | 44,000 | 38,000
Debt issue costs | 0 | 0 | (56)
Repurchases of common stock | (369,319) | (282,565) | (304,086)
Proceeds from exercises of stock options and employee stock purchase plans | 38,201 | 38,622 | 38,344
Payment of acquisition-related contingent consideration | (1,266) | 0 | (4,728)
Shares withheld for statutory tax withholding on restricted stock (Note 2) | (9,375) | (8,073) | (4,372)
Tax benefit from share-based compensation arrangements | 0 | 0 | 14,702
Net cash used by financing activities | (597,799) | (208,016) | (222,196)
Net effect of changes in exchange rates on cash | (4,768) | 6,202 | (54)
Net increase (decrease) in cash and cash equivalents | (63,881) | 32,774 | 25,907
Cash and cash equivalents at beginning of period | 187,675 | 154,901 | 128,994
Cash and cash equivalents at end of period | $ 123,794 | $ 187,675 | $ 154,901

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