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UNAUDITED CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2020 | Mar. 31, 2019
Cash flows from operating activities: |  |
Net income | $ 35,239 | $ 11,500
Adjustments to reconcile net income to net cash provided by operating activities: |  |
Amortization of deferred financing costs | 83 | 83
Amortization of investment discount/premium | 65 | 127
Depreciation and amortization | 25,733 | 25,983
Deferred income taxes | (2,108) | 10,834
Stock-based compensation | 3,025 | 3,010
Impairment of right-of-use lease assets | 453 | 0
Changes in assets and liabilities: |  |
Tuition receivable, net | 3,553 | 4,847
Other current assets | (3,321) | (1,060)
Other assets | 231 | 325
Accounts payable and accrued expenses | (7,028) | (3,537)
Income taxes payable and income taxes receivable | 12,314 | 6,031
Contract liabilities | 1,901 | 1,702
Other long-term liabilities | (1,445) | (1,187)
Net cash provided by operating activities | 68,695 | 58,658
Cash flows from investing activities: |  |
Purchases of property and equipment | (14,258) | (8,756)
Purchases of marketable securities | (1,863) | (6,249)
Maturities of marketable securities | 9,905 | 12,910
Other investments | (118) | (374)
Net cash used in investing activities | (6,334) | (2,469)
Cash flows from financing activities: |  |
Common dividends paid | (13,327) | (11,091)
Net payments for stock awards | (25,089) | (4,443)
Repurchase of common stock | (247) | 0
Net cash used in financing activities | (38,663) | (15,534)
Net increase in cash, cash equivalents, and restricted cash | 23,698 | 40,655
Cash, cash equivalents, and restricted cash — beginning of period | 420,497 | 312,237
Cash, cash equivalents, and restricted cash — end of period | 444,195 | 352,892
Noncash transactions: |  |
Non-cash additions to property and equipment | 1,392 | 634
Right-of-use lease assets obtained in exchange for operating lease liabilities | $ 3,504 | $ 1,190

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