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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands | 6 Months Ended
--- | ---
Jun. 30, 2019 | Jun. 30, 2018
Cash Flows from Operating Activities: |  |
Net income | $ 228,410 | $ 198,156
Adjustments to reconcile net income to net cash provided by operating activities: |  |
Depreciation and amortization | 42,976 | 41,696
Benefit of deferred income taxes | 3,426 | 8,638
Share-based compensation expense | 13,232 | 12,352
Other | 747 | 1,613
Changes in assets and liabilities: |  |
Accounts receivable | (37,699) | (32,872)
Inventories | (22,911) | (16,825)
Other assets and liabilities | (45,822) | (55,781)
Accounts payable | (4,030) | 3
Deferred revenue | (6,849) | (3,252)
Net cash provided by operating activities | 171,480 | 153,728
Cash Flows from Investing Activities: |  |
Purchases of property and equipment | (71,987) | (51,377)
Purchase of marketable securities | 0 | (87)
Proceeds from the sale and maturities of marketable securities | 0 | 284,125
Acquisition of a business | (304) | 0
Net cash (used) provided by investing activities | (72,291) | 232,661
Cash Flows from Financing Activities: |  |
Repayments on revolving credit facilities, net | (147,519) | (218,000)
Issuance of senior notes | 100,000 | 0
Debt issuance costs | (142) | 0
Payment of acquisition-related contingent consideration | (1,695) | (1,000)
Repurchases of common stock | (74,994) | (189,884)
Proceeds from exercises of stock options and employee stock purchase plans | 19,653 | 21,905
Shares withheld for statutory tax withholding on restricted stock | (7,572) | (8,720)
Net cash used by financing activities | (112,269) | (395,699)
Net effect of changes in exchange rates on cash | 131 | (3,806)
Net decrease in cash and cash equivalents | (12,949) | (13,116)
Cash and cash equivalents at beginning of period | 123,794 | 187,675
Cash and cash equivalents at end of period | 110,845 | 174,559
Supplemental Cash Flow Information: |  |
Unpaid property and equipment, reflected in accounts payable and accrued liabilities | $ 11,633 | $ 9,419

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