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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Cash flows from operating activities:    
Net income $ 4,276 $ 2,376
Adjustments to reconcile net income to net cash flows provided by operating activities:    
Depreciation and amortization 20,508 22,518
Provision for doubtful accounts 1,122 1,260
Amortization of debt discount and debt issuance costs 168 126
Stock-based compensation 1,336 1,160
Deferred income taxes (2,504) (1,135)
(Gain) loss on equity investments (2,188) 1,775
Loss on disposition of long-lived assets 117 15
Unrealized (gain) loss on foreign currency (81) 739
Changes in operating assets and liabilities, excluding the effects of acquisitions and dispositions:    
Accounts receivable 1,430 (10,887)
Customer receivable (12,579)  
Materials and supplies, prepayments, and other current assets (253) 431
Prepaid income taxes   399
Accounts payable and accrued liabilities, advance payments and deposits and other current liabilities (7,648) (4,055)
Accrued taxes 1,810 355
Other assets (242) 298
Other liabilities 51 84
Net cash provided by operating activities 5,323 15,459
Cash flows from investing activities:    
Capital expenditures (19,495) (14,061)
Reimbursable capital expenditures (6,185)  
Receipt of government grants 3,292  
Divestiture of businesses, net of transferred cash of $0.9 million 18,597  
Purchases of strategic investments (4,155) (2,768)
Net cash used in investing activities (7,946) (16,829)
Cash flows from financing activities:    
Dividends paid on common stock (2,703) (2,721)
Distributions to non-controlling interests (3,530) (4,220)
Payment of debt issuance costs 53 (1,010)
Principal repayments of term loan (938) (938)
Purchases of common stock - stock-based compensation (1,677) (1,625)
Purchases of common stock - share repurchase plan (540) (1,600)
Repurchases of non-controlling interests (11,522) (1,774)
Customer receivable credit facility borrowing 10,814  
Net cash used in financing activities (10,043) (13,888)
Effect of foreign currency exchange rates on cash and cash equivalents   (115)
Net change in cash, cash equivalents, and restricted cash (12,666) (15,373)
Total cash, cash equivalents, and restricted cash, beginning of period 104,997 162,358
Total cash, cash equivalents, and restricted cash, end of period 92,331 146,985
Noncash investing activity:    
Purchases of property, plant and equipment included in accounts payable and accrued expenses $ 10,075 $ 8,393