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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands | 9 Months Ended
--- | ---
Sep. 30, 2019 | Sep. 30, 2018
Cash flows from operating activities |  |
Net income | $ 56,209 | $ 61,032
Adjustments to reconcile net income to net cash (used in) provided by operating activities: |  |
Depreciation and amortization expense | 5,674 | 4,529
Amortization of right-of-use assets | 15,433 | 0
Provision of bad debt expense | 75 | 52
Stock-based compensation | 7,040 | 8,919
Deferred taxes, net | 3,829 | (735)
Net realized gains on marketable securities, available-for-sale | (70) | (12)
Other non-cash items | 489 | (148)
Changes in operating assets and liabilities: |  |
Commissions receivable | (1,368) | 4,183
Prepaid expenses | (1,426) | 3,145
Prepaid rent | 0 | 875
Other assets, net | (31,302) | (9,066)
Accounts payable and other liabilities | 103 | (1,552)
Income tax receivable/payable | (12,272) | 7,271
Accrued bonuses and other employee related expenses | (11,314) | (558)
Deferred compensation and commissions | (24,409) | (23,739)
Operating lease liabilities | (12,725) | 0
Deferred rent and other liabilities | (19) | 817
Net cash (used in) provided by operating activities | (6,053) | 55,013
Cash flows from investing activities |  |
Acquisition, net of cash received | 0 | (6,990)
Purchases of marketable securities, available-for-sale | (115,744) | (168,672)
Proceeds from sales and maturities of marketable securities, available-for-sale | 143,638 | 88,027
Issuances of employee notes receivable | (200) | (126)
Payments received on employee notes receivable | 28 | 12
Purchase of property and equipment | (6,643) | (4,574)
Net cash provided by (used in) investing activities | 21,079 | (92,323)
Cash flows from financing activities |  |
Taxes paid related to net share settlement of stock-based awards | (2,694) | (1,777)
Proceeds from issuance of shares pursuant to employee stock purchase plan | 338 | 356
Principal payments on notes payable to former stockholders | (1,087) | (1,035)
Principal payments on stock appreciation rights liability | (185) | 0
Net cash used in financing activities | (3,628) | (2,456)
Net increase (decrease) in cash and cash equivalents | 11,398 | (39,766)
Cash and cash equivalents at beginning of period | 214,683 | 220,786
Cash and cash equivalents at end of period | 226,081 | 181,020
Supplemental disclosures of cash flow information |  |
Interest paid during the period | 2,092 | 2,180
Income taxes paid, net | $ 29,602 | $ 16,237

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