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Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2020 | Dec. 31, 2019 | Jun. 30, 2020
Cash flows from operating activities: |  |  |  |  |
Net income | $ 456,983 | $ 380,305 | $ 877,125 | $ 726,701 |
Adjustments to reconcile net income to net cash provided by operating activities: |  |  |  |  |
Depreciation and amortization |  |  | 164,323 | 187,122 |
Loss (gain) on unrealized foreign exchange and other |  |  | (18,570) | 4,763 |
Asset impairment charges |  |  | 865 | 2,581 |
Stock-based compensation expense |  |  | 53,819 | 53,733 |
Changes in assets and liabilities, net of assets acquired and liabilities assumed in business acquisitions: |  |  |  |  |
Accounts receivable |  |  | (117,189) | (201,896) |
Inventories |  |  | (112,206) | (6,568) |
Other assets |  |  | (51,287) | (5,372) |
Accounts payable |  |  | (1,783) | 54,143 |
Deferred system revenue |  |  | (61,595) | (35,245) |
Deferred service revenue |  |  | (1,431) | (3,117) |
Other liabilities |  |  | 341,181 | 107,131 |
Net cash provided by operating activities |  |  | 1,073,252 | 883,976 |
Cash flows from investing activities: |  |  |  |  |
Proceeds from sale of assets |  |  | 1,855 | 0 |
Business acquisitions, net of cash acquired |  |  | 0 | (78,530) |
Capital expenditures |  |  | (115,069) | (67,440) |
Purchases of available-for-sale securities |  |  | (492,048) | (408,482) |
Proceeds from sale of available-for-sale securities |  |  | 110,812 | 35,736 |
Proceeds from maturity of available-for-sale securities |  |  | 259,327 | 357,450 |
Purchases of trading securities |  |  | (35,371) | (21,873) |
Proceeds from sale of trading securities |  |  | 39,668 | 27,212 |
Proceeds from other investments |  |  | 614 | 1,086 |
Net cash used in investing activities |  |  | (230,212) | (154,841) |
Cash flows from financing activities: |  |  |  |  |
Payment of debt issuance costs |  |  | 40,343 | 0 |
Proceeds from revolving credit facility |  |  | 0 | 250,000 |
Repayment of debt |  |  | (50,000) | (275,000) |
Common stock repurchases |  |  | (365,389) | (513,089) |
Payment of dividends to stockholders |  |  | (280,748) | (256,332) |
Issuance of common stock |  |  | 26,356 | 24,613 |
Tax withholding payments related to vested and released restricted stock units |  |  | (36,145) | (35,775) |
Payment of contingent consideration payable |  |  | 0 | (60) |
Net cash used in financing activities |  |  | (665,583) | (805,643) |
Effect of exchange rate changes on cash and cash equivalents |  |  | 19,600 | 378 |
Net increase (decrease) in cash and cash equivalents |  |  | 197,057 | (76,130) |
Cash and cash equivalents at beginning of period |  |  | 1,234,409 | 1,015,994 | $ 1,015,994
Cash and cash equivalents at end of period | $ 1,431,466 | $ 939,864 | 1,431,466 | 939,864 | $ 1,234,409
Supplemental cash flow disclosures: |  |  |  |  |
Income taxes paid |  |  | 113,949 | 70,746 |
Interest paid |  |  | 76,996 | 79,486 |
Non-cash activities: |  |  |  |  |
Contingent consideration (receivable) payable - financing activities |  |  | (8,748) | 5,825 |
Dividends payable - financing activities |  |  | 1,203 | 3,190 |
Unsettled common stock repurchase - financing activities |  |  | 6,000 | 4,000 |
Accrued purchases of land, property and equipment - investing activities |  |  | $ 25,987 | $ 13,755 |

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- Definition Amount of cash outflow to acquire investments classified as other. + 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 -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3213-108585 + Details
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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=121586364&loc=d3e3213-108585 + Details
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- Definition The cash inflow from additional borrowings, net of cash paid to third parties in connection with debt origination. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3255-108585 + Details
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- Definition The cash inflow from the additional capital contribution to the entity. + 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=121586364&loc=d3e3255-108585 + Details
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- Definition The cash inflow from a contractual arrangement with the lender, including letter of credit, standby letter of credit and revolving credit arrangements, under which borrowings can be made up to a specific amount at any point in time with maturities due beyond one year or 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=121586364&loc=d3e3255-108585 + Details
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- Definition Amount of cash inflow from maturity, prepayment and call of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=121553693&loc=d3e26853-111562 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3151-108585 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3179-108585 + Details
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