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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands | 6 Months Ended
--- | ---
Jun. 30, 2021 | Jun. 30, 2020
Cash flows from operating activities: |  |
Net income | $ 7,565 | $ 10,742
Adjustments to reconcile net income to net cash flows provided by operating activities: |  |
Depreciation and amortization | 40,662 | 44,509
Provision for doubtful accounts | 2,299 | 3,397
Amortization of debt discount and debt issuance costs | 337 | 260
Stock-based compensation | 3,511 | 2,721
Deferred income taxes | (3,236) | (3,204)
(Gain) loss on equity investments | (1,793) | 1,412
Loss on disposition of long-lived assets | 861 | 64
Unrealized (gain) loss on foreign currency | (81) | 780
Changes in operating assets and liabilities, excluding the effects of acquisitions and dispositions: |  |
Accounts receivable | 1,226 | (14,475)
Customer receivable | (21,586) |
Materials and supplies, prepayments, and other current assets | (73) | (7,313)
Prepaid income taxes |  | 399
Accounts payable and accrued liabilities, advance payments and deposits and other current liabilities | (1,745) | 2,497
Accrued taxes | (1,360) | (1,838)
Other assets | 782 | 993
Other liabilities | 91 | (569)
Net cash provided by operating activities | 27,460 | 40,375
Cash flows from investing activities: |  |
Capital expenditures | (35,424) | (30,597)
Reimbursable capital expenditures | (6,508) | (1,368)
Receipt of capital government grants | 3,292 |
Divestiture of businesses, net of transferred cash of $0.9 million | 18,597 |
Purchase of intangible assets; including deposits |  | (20,000)
Purchases of strategic investments | (5,242) | (2,768)
Net cash used in investing activities | (25,285) | (54,733)
Cash flows from financing activities: |  |
Dividends paid on common stock | (5,411) | (5,443)
Distributions to non-controlling interests | (4,488) | (5,541)
Repayment of customer receivable credit facility | (384) |
Payment of debt issuance costs |  | (1,059)
Principal repayments of term loan | (1,883) | (1,876)
Purchases of common stock - stock-based compensation | (1,713) | (1,733)
Purchases of common stock - share repurchase plan | (2,219) | (2,449)
Repurchases of non-controlling interests | (12,699) | (3,911)
Proceeds from customer receivable credit facility | 17,582 |
Net cash used in financing activities | (11,215) | (22,012)
Effect of foreign currency exchange rates on cash and cash equivalents |  | (118)
Net change in cash, cash equivalents, and restricted cash | (9,040) | (36,488)
Total cash, cash equivalents, and restricted cash, beginning of period | 104,997 | 162,358
Total cash, cash equivalents, and restricted cash, end of period | 95,957 | 125,870
Noncash investing activity: |  |
Purchases of property, plant and equipment included in accounts payable and accrued expenses | $ 11,990 | $ 7,715

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