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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 | $ 86,080 | $ 86,946
Adjustments to reconcile net income to net cash provided by operating activities: |  |
Deferred income taxes | 18,940 | 0
Depreciation and amortization | 7,080 | 6,936
Stock-based compensation | 1,079 | 3,621
Amortization of debt discount and issuance costs | 3,820 | 4,028
Amortization of discount on short-term investments | (1,124) | (160)
Amortization of lease guarantee | (162) | (162)
Loss on extinguishment of debt | 0 | 3,137
Changes in operating assets and liabilities: |  |
Receivables from collaborative arrangements | 15,723 | (2)
Prepaid expenses and other current assets | 390 | 178
Accounts payable | 1,128 | (543)
Accrued personnel-related expenses and other accrued liabilities | 343 | (1,539)
Accrued interest payable | (2) | (805)
Operating lease liability | (144) |
Other long-term liabilities | 0 | 4
Net cash provided by operating activities | 133,151 | 101,639
Cash flows from investing activities |  |
Maturities of marketable securities | 57,875 | 54,875
Purchases of marketable securities | (111,935) | (19,284)
Net cash provided by (used in) investing activities | (54,060) | 35,591
Cash flows from financing activities |  |
Repurchase of shares to satisfy tax withholding | (74) | (2,840)
Payments of principal on senior secured term loans | 0 | (120,000)
Payments of cash dividends to stockholders | (11) | (55)
Proceeds from issuances of common stock, net | 529 | 454
Distributions to noncontrolling interest | 0 | (899)
Net cash provided by (used in) financing activities | 444 | (123,340)
Net increase in cash and cash equivalents | 79,535 | 13,890
Cash and cash equivalents at beginning of period | 62,417 | 73,336
Cash and cash equivalents at end of period | 141,952 | 87,226
Supplemental disclosure of cash flow information |  |
Cash paid for interest | $ 5,461 | $ 10,913

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