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Consolidated Statements of Cash Flows - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Cash flows from operating activities: |  |  |
Net income | $ 505,868 | $ 404,389 | $ 333,817
Adjustments to reconcile net income to net cash provided by operating activities: |  |  |
Depreciation | 28,792 | 27,311 | 26,440
Amortization | 48,895 | 48,275 | 45,392
Equity in earnings of unconsolidated affiliates | (159,791) | (152,550) | (126,103)
Distributions received from unconsolidated affiliate | 166,941 | 143,517 | 125,224
Stock-based compensation | 23,805 | 36,366 | 16,017
Provision for losses on receivables | 23 | 172 | (126)
Deferred income tax expense | 5,998 | (21,046) | 4,794
Net loss (gain) from investments | 325 | (1,269) | (112)
Change in long-term taxes payable | (9,826) | 10,629 | 0
Change in other long-term liabilities | 145 | (2,265) | 3,248
Change in other assets | (4,785) | (1,489) | (1,917)
Contract costs capitalized, net | (5,366) | 0 | 0
Gain from sale of SEI AK | 0 | 0 | (2,791)
Tax benefit on stock options exercised | 0 | 0 | 8,984
Other | (294) | (2,186) | 390
Change in current assets and liabilities: |  |  |
Decrease (increase) in Receivables from investment products | 6,797 | 5,095 | (13,663)
Decrease (increase) in Receivables | (32,652) | (52,726) | (4,807)
Decrease (increase) in Other current assets | (5,518) | (3,583) | (1,368)
Increase (decrease) in Accounts payable | 5,652 | (909) | 1,455
Increase (decrease) in Accrued liabilities | 13,079 | 20,992 | 18,851
Increase (decrease) in Deferred revenue | 313 | 1,180 | 495
Total adjustments | 82,533 | 55,514 | 100,403
Net cash provided by operating activities | 588,401 | 459,903 | 434,220
Cash flows from investing activities: |  |  |
Additions to property and equipment | (29,095) | (25,525) | (31,397)
Additions to capitalized software | (44,221) | (61,043) | (50,392)
Purchases of marketable securities | (203,460) | (69,525) | (73,193)
Prepayments and maturities of marketable securities | 167,876 | 65,830 | 54,141
Sales of marketable securities | 0 | 0 | 15,152
Cash paid for acquisition, net of cash acquired | (5,794) | (80,234) | 0
Receipt of contingent payment from sale of SEI AK | 0 | 0 | 2,791
Other investing activities | (8,676) | (1,805) | 1,313
Net cash used in investing activities | (123,370) | (172,302) | (81,585)
Cash flows from financing activities: |  |  |
Repayments under revolving credit facility | (30,000) | (10,000) | 0
Borrowings under revolving credit facility | 0 | 40,000 | 0
Purchase and retirement of common stock | (407,384) | (248,339) | (292,258)
Proceeds from issuance of common stock | 87,982 | 53,568 | 48,272
Payment of dividends | (94,318) | (88,862) | (84,686)
Net cash used in financing activities | (443,720) | (253,633) | (328,672)
Effect of exchange rate changes on cash, cash equivalents and restricted cash | (11,024) | 14,583 | (9,923)
Net increase in cash, cash equivalents and restricted cash | 10,287 | 48,551 | 14,040
Cash, cash equivalents and restricted cash, beginning of year | 747,752 | 699,201 | 685,161
Cash, cash equivalents and restricted cash, end of year | 758,039 | 747,752 | 699,201
Interest paid | 806 | 699 | 531
Income taxes paid | 110,203 | 165,049 | 157,255
Non-cash financing activities |  |  |
Dividends declared but not paid | $ 50,761 | $ 47,179 | $ 44,596

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