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Consolidated Statements of Cash Flows $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($)
Cash flows from operating activities: |  |  |
Net income | $ 501,426 | $ 505,868 | $ 404,389
Adjustments to reconcile net income to net cash provided by operating activities: |  |  |
Depreciation | 29,436 | 28,792 | 27,311
Amortization | 51,419 | 48,895 | 48,275
Equity in earnings of unconsolidated affiliates | (151,891) | (159,791) | (152,550)
Distributions received from unconsolidated affiliate | 136,820 | 166,941 | 143,517
Stock-based compensation | 24,582 | 23,805 | 36,366
Provision for losses on receivables | 483 | 23 | 172
Deferred income tax (benefit) expense | (3,414) | 5,998 | (21,046)
Net (gain) loss from investments | (3,174) | 325 | (1,269)
Change in long-term taxes payable | 0 | (9,826) | 10,629
Change in other long-term liabilities | (163) | 145 | (2,265)
Change in other assets | 1,791 | (4,785) | (1,489)
Contract costs capitalized, net | (6,984) | (5,366) | 0
Other | 620 | (294) | (2,186)
Decrease (increase) in: |  |  |
Receivables from investment products | (4,296) | 6,797 | 5,095
Receivables | (25,505) | (32,652) | (52,726)
Other current assets | 3,334 | (5,518) | (3,583)
Increase (decrease) in: |  |  |
Accounts payable | (6,497) | 5,652 | (909)
Accrued liabilities | (4,896) | 13,079 | 20,992
Deferred revenue | 2,031 | 313 | 1,180
Total adjustments | 43,696 | 82,533 | 55,514
Net cash provided by operating activities | 545,122 | 588,401 | 459,903
Cash flows from investing activities: |  |  |
Additions to property and equipment | (43,097) | (29,095) | (25,525)
Additions to capitalized software | (34,074) | (44,221) | (61,043)
Purchases of marketable securities | (174,997) | (203,460) | (69,525)
Prepayments and maturities of marketable securities | 171,399 | 167,876 | 65,830
Sales of marketable securities | 51 | 0 | 0
Cash paid for acquisition, net of cash acquired | 0 | (5,794) | (80,234)
Other investing activities | 2,538 | (8,676) | (1,805)
Net cash used in investing activities | (78,180) | (123,370) | (172,302)
Cash flows from financing activities: |  |  |
Payment of contingent consideration | (433) | 0 | 0
Repayments under revolving credit facility | 0 | (30,000) | (10,000)
Borrowings under revolving credit facility | 0 | 0 | 40,000
Purchase and retirement of common stock | (346,352) | (407,384) | (248,339)
Proceeds from issuance of common stock | 60,910 | 87,982 | 53,568
Payment of dividends | (100,745) | (94,318) | (88,862)
Net cash used in financing activities | (386,620) | (443,720) | (253,633)
Effect of exchange rate changes on cash, cash equivalents and restricted cash | 6,186 | (11,024) | 14,583
Net increase in cash, cash equivalents and restricted cash | 86,508 | 10,287 | 48,551
Cash, cash equivalents and restricted cash, beginning of year | 758,039 | 747,752 | 699,201
Cash, cash equivalents and restricted cash, end of year | 844,547 | 758,039 | 747,752
Interest paid | 493 | 806 | 699
Income taxes paid | 139,326 | 110,203 | 165,049
Non-cash operating activities |  |  |
Operating lease right-of-use assets and net lease liabilities recorded upon adoption of ASC 842 | 44,169 |  |
Non-cash financing activities |  |  |
Dividends declared but not paid | $ 52,452 | $ 50,761 | $ 47,179

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