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CONSOLIDATED STATEMENTS OF CASH FLOWS $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($)
Cash flows from operating activities: |  |  |
Net income | $ 1,967 | $ 34,872 | $ 48,894
Adjustments to reconcile net income to net cash flows provided by operating activities: |  |  |
Depreciation and amortization | 89,125 | 85,719 | 86,934
Provision for doubtful accounts | 5,816 | 5,134 | 3,993
Amortization of debt discount and debt issuance costs | 542 | 763 | 670
Stock-based compensation | 6,384 | 6,420 | 6,977
Deferred income taxes | (2,192) | (23,242) | (13,505)
Loss on equity investments | 4,724 |  | 2,033
(Gain) loss on disposition of long-lived assets | 2,841 | (26,425) | 101
Goodwill impairment | 3,279 | 0 | 0
Loss on damaged assets from Hurricanes |  |  | 35,443
Insurance recovery related to hurricane claims |  |  | (34,606)
Unrealized loss on foreign currency | 362 | 1,342 | (1,209)
Gain on sale of investments |  |  | (826)
Loss on deconsolidation of subsidiary |  |  | 529
Other non-cash activity | (42) | 308 | 424
Changes in operating assets and liabilities, excluding the effects of acquisitions and dispositions: |  |  |
Accounts receivable | (3,511) | (1,682) | (4,074)
Materials and supplies, prepayments, and other current assets | (1,613) | 5,924 | 1,002
Prepaid income taxes | 4,581 | 3,147 | 996
Accounts payable and accrued liabilities, advance payments and deposits and other current liabilities | (2,536) | (7,044) | 4,649
Accrued taxes | (19,053) | 29,089 | (1,385)
Other assets | (5,711) | (238) | 4,102
Other liabilities | 2,940 | 1,778 | 4,583
Net cash provided by operating activities | 87,903 | 115,865 | 145,725
Cash flows from investing activities: |  |  |
Capital expenditures | (72,602) | (105,769) | (133,786)
Hurricane rebuild capital expenditures | (123) | (80,152) | (8,585)
Hurricane insurance proceeds |  | 34,606 |
Receipt of government grants | 3,140 | 5,400 |
Acquisition of business, net of acquired cash of $0.0 million |  |  | (1,183)
Purchase of spectrum licenses and other intangible assets, including deposits |  |  | (36,832)
Divestiture of businesses, net of transferred cash of $0.0 million, $11.5 million, and $2.1 million, respectively | 6,572 | 48,270 | 22,381
Purchase of strategic investments | (25,362) | (3,000) | (18,107)
Purchase of short-term investments | (8,028) | (138) |
Proceeds from sale of short-term investments | 8,141 | 6,564 | 3,794
Proceeds from disposition of long-lived assets |  | 6,900 |
Net cash used in investing activities | (88,262) | (87,319) | (172,318)
Cash flows from financing activities: |  |  |
Dividends paid on common stock | (10,880) | (10,866) | (19,227)
Proceeds from new borrowings |  |  | 8,571
Distributions to non-controlling interests | (7,161) | (18,780) | (6,858)
Payment of debt issuance costs | (1,340) |  | (326)
Acquisition of business, net of acquired cash of $0.0 million |  |  | (1,178)
Principal repayments of term loan | (4,700) | (9,795) | (9,355)
Proceeds from stock option exercises |  | 72 | 1,030
Stock-based compensation share repurchases | (1,649) | (4,622) | (2,220)
Purchases of common stock- share repurchase plan | (162) | (1,576) | (10,635)
Repurchases of non-controlling interests | (4,504) | (9,663) | (2,025)
Investments made by minority shareholders in consolidated affiliates | 488 |  | 122
Net cash used in financing activities | (29,908) | (55,230) | (42,101)
Effect of foreign currency exchange rates on cash and cash equivalents | (282) | (299) | 226
Net change in cash, cash equivalents, and restricted cash | (30,549) | (26,983) | (68,468)
Total cash, cash equivalents, and restricted cash, beginning of period | 192,907 | 219,890 | 288,358
Total cash, cash equivalents, and restricted cash, end of period | 162,358 | 192,907 | 219,890
Supplemental cash flow information: |  |  |
Interest paid | 4,554 | 7,235 | 7,411
Taxes paid | 30,411 | 12,486 | 13,685
Dividends declared, not paid | 2,721 | 2,720 | 2,724
Noncash investing activity: |  |  |
Transfer from inventory, materials and supplies to property, plant and equipment |  | 6,708 |
Purchases of property, plant and equipment included in accounts payable and accrued expenses | $ 11,668 | $ 12,877 | $ 19,466

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