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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Cash flows from operating activities:    
Net income $ 10,742 $ 2,763
Adjustments to reconcile net income to net cash flows provided by operating activities:    
Depreciation and amortization 44,509 42,267
Provision for doubtful accounts 3,397 2,736
Amortization of debt discount and debt issuance costs 260 290
Stock-based compensation 2,721 3,334
Deferred income taxes (3,204) (4,574)
Loss on equity investments 1,412  
Loss on disposition of long-lived assets 64 191
Unrealized loss on foreign currency 780 (160)
Other non-cash activity   11
Changes in operating assets and liabilities, excluding the effects of acquisitions and dispositions:    
Accounts receivable (14,475) (14,886)
Materials and supplies, prepayments, and other current assets (7,313) (9,130)
Prepaid income taxes 399 5,158
Accounts payable and accrued liabilities, advance payments and deposits and other current liabilities 2,497 10,570
Accrued taxes (1,838) (22,011)
Other assets 993 251
Other liabilities (569) 1,712
Net cash provided by operating activities 40,375 18,522
Cash flows from investing activities:    
Capital expenditures (31,965) (35,396)
Purchase intangible assets, including deposits (20,000)  
Purchases of strategic investments (2,768) (10,000)
Purchase of short-term investments   (5,028)
Proceeds from sale of short-term investments   141
Net cash used in investing activities (54,733) (50,283)
Cash flows from financing activities:    
Dividends paid on common stock (5,443) (5,439)
Distributions to non-controlling interests (5,541) (3,878)
Payment of debt issuance costs (1,059) (1,340)
Principal repayments of term loan (1,876) (1,887)
Purchases of common stock - share based compensation (1,733) (1,578)
Purchases of common stock - share buyback (2,449)  
Repurchases of non-controlling interests (3,911) (861)
Investments made by minority shareholders in consolidated affiliates   488
Net cash used in financing activities (22,012) (14,495)
Effect of foreign currency exchange rates on cash and cash equivalents (118) 31
Net change in cash, cash equivalents, and restricted cash (36,488) (46,225)
Total cash, cash equivalents, and restricted cash, beginning of period 162,358 192,907
Total cash, cash equivalents, and restricted cash, end of period 125,870 146,682
Noncash investing activity:    
Purchases of property, plant and equipment included in accounts payable and accrued expenses $ 7,715 $ 6,356