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UNAUDITED CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands | 9 Months Ended
--- | ---
Sep. 30, 2020 | Sep. 30, 2019
Cash flows from operating activities: |  |
Net income | $ 80,351 | $ 52,601
Adjustments to reconcile net income to net cash provided by operating activities: |  |
Amortization of deferred financing costs | 250 | 250
Amortization of investment discount/premium | 108 | 286
Depreciation and amortization | 78,189 | 78,862
Deferred income taxes | (12,867) | 971
Stock-based compensation | 10,759 | 9,075
Impairment of right-of-use lease assets | 453 | 0
Changes in assets and liabilities: |  |
Tuition receivable, net | (1,224) | 2,258
Other assets | (8,684) | (1,648)
Accounts payable and accrued expenses | 681 | (2,022)
Income taxes payable | 10,674 | (7,125)
Contract liabilities | 4,540 | 10,311
Other long-term liabilities | (4,444) | (2,412)
Net cash provided by operating activities | 158,786 | 141,407
Cash flows from investing activities: |  |
Purchases of property and equipment | (34,787) | (27,769)
Purchases of marketable securities | (1,863) | (17,769)
Proceeds from marketable securities | 22,868 | 32,860
Other investments | (768) | (878)
Net cash used in investing activities | (14,550) | (13,556)
Cash flows from financing activities: |  |
Net proceeds from issuance of common stock | 220,248 | 0
Common dividends paid | (41,305) | (33,297)
Net payments for stock awards | (24,778) | (9,195)
Repurchase of common stock | (247) | 0
Net cash provided by (used in) financing activities | 153,918 | (42,492)
Net increase in cash, cash equivalents, and restricted cash | 298,154 | 85,359
Cash, cash equivalents, and restricted cash — beginning of period | 420,497 | 312,237
Cash, cash equivalents, and restricted cash — end of period | 718,651 | 397,596
Noncash transactions: |  |
Non-cash additions to property and equipment | 2,496 | 3,977
Right-of-use lease assets obtained in exchange for operating lease liabilities | $ 12,427 | $ 4,082

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