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Consolidated Statements of Cash Flows - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Cash flows from operating activities: |  |  |
Net income (loss) | $ 81,138 | $ (15,671) | $ 20,612
Adjustments to reconcile net income (loss) to net cash provided by operating activities: |  |  |
Amortization of gain on sale of assets | 0 | 0 | (133)
Amortization of deferred financing costs | 333 | 292 | 262
Amortization of investment discount/premium | 296 | 298 | 0
Depreciation and amortization | 104,861 | 54,543 | 18,733
Deferred income taxes | (8,037) | (16,322) | 6,429
Stock-based compensation | 12,160 | 15,532 | 11,627
Fair value adjustments and impairment of intangible assets | 0 | 19,909 | (7,512)
Impairment of right-of-use lease assets | 6,046 |  |
Changes in assets and liabilities: |  |  |
Tuition receivable, net | 1,770 | 7,880 | (3,250)
Other current assets | (1,589) | 3,768 | (526)
Other assets | (540) | (135) | 1,582
Accounts payable and accrued expenses | 245 | 1,140 | 4,468
Income taxes payable and income taxes receivable | 1,198 | (516) | (629)
Contract liabilities | 7,716 | (19,329) | 8,212
Other long-term liabilities | (3,451) | (4,522) | (3,718)
Net cash provided by operating activities | 202,146 | 46,867 | 56,157
Cash flows from investing activities: |  |  |
Net cash acquired in acquisition | 0 | 167,859 | 0
Purchases of property and equipment | (38,689) | (27,547) | (18,051)
Purchases of marketable securities | (40,481) | (25,304) | 0
Maturities of marketable securities | 43,762 | 16,367 | 0
Other investments | (2,658) | (1,238) | 0
Net cash provided by (used in) investing activities | (38,066) | 130,137 | (18,051)
Cash flows from financing activities: |  |  |
Common dividends paid | (46,625) | (27,842) | (11,416)
Net payments for stock awards | (9,195) | 7,789 | 0
Payment of deferred financing costs | 0 | (1,162) | 0
Net cash used in financing activities | (55,820) | (21,215) | (11,416)
Net increase in cash, cash equivalents, and restricted cash | 108,260 | 155,789 | 26,690
Cash, cash equivalents, and restricted cash - beginning of period | 312,237 | 156,448 | 129,758
Cash, cash equivalents, and restricted cash - end of period | 420,497 | 312,237 | 156,448
Noncash transactions: |  |  |
Purchases of property and equipment included in accounts payable | $ 3,406 | $ 1,029 | $ 1,734

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