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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Cash flows from operating activities:      
Net income $ (20,809) $ (708) $ 1,967
Adjustments to reconcile net income to net cash flows provided by operating activities:      
Depreciation 102,731 86,504 86,963
Amortization of acquisition intangibles 7,775 1,807 2,162
Provision for doubtful accounts 4,850 5,010 5,816
Amortization of debt discount and debt issuance costs 1,275 530 542
Stock-based compensation 6,581 5,912 6,384
Deferred income taxes (6,612) (7,317) (2,192)
Loss on equity investments 86 3,427 4,724
Loss on disposition of long-lived assets 2,759 21,572 2,841
Goodwill impairment 20,587 0 3,279
Unrealized (gain) loss on foreign currency (81) 357 362
Other non-cash activity     (42)
Changes in operating assets and liabilities, excluding the effects of acquisitions and dispositions:      
Accounts receivable (4,900) (17,774) (3,511)
Customer receivable (32,955)    
Materials and supplies, prepayments, and other current assets (5,297) (18,624) (1,613)
Prepaid income taxes 84 2,218 4,581
Accounts payable and accrued liabilities, advance payments and deposits and other current liabilities 11,681 12,597 (2,536)
Accrued taxes (3,953) 799 (19,053)
Other assets (226) (8,790) (5,711)
Other liabilities (3,028) (1,236) 2,940
Net cash provided by operating activities 80,548 86,284 87,903
Cash flows from investing activities:      
Capital expenditures (96,442) (60,358) (72,725)
Reimbursable capital expenditures (9,700) (14,965)  
Receipt of capital government grants 7,517 16,316 3,140
Divestiture of businesses, net of transferred cash of $0.9 million 18,597   6,572
Acquisition of business net of $11.9 million of cash acquired (340,152)    
Purchase of spectrum; including deposits   (20,396)  
Proceeds from strategic investments   11,969  
Purchases of strategic investments (6,399) (2,768) (25,362)
Purchase of short-term investments   (116) (8,028)
Proceeds from sale of short-term investments   120 8,141
Net cash used in investing activities (426,579) (70,198) (88,262)
Cash flows from financing activities:      
Dividends paid on common stock (10,813) (10,891) (10,880)
Distributions to noncontrolling interests (7,468) (10,368) (7,161)
Payment of debt issuance costs (6,568) (1,096) (1,340)
Term loan - borrowing 210,000    
Term loan - repayments (8,758) (13,751) (4,700)
Revolving credit facility - borrowings 97,000    
Revolving credit facility - repayments (33,500)    
Repayment of customer receivable credit facility (1,828)    
Purchases of common stock - stock- based compensation (1,713) (1,733) (1,649)
Purchases of common stock - share repurchase plan (10,546) (6,589) (162)
Proceeds from exercise of stock options 383    
Redeemable noncontrolling interests contribution 71,533    
Repurchases of noncontrolling interests (13,312) (28,939) (4,504)
Investments made by minority shareholders in consolidated affiliates     488
Proceeds from customer receivable credit facility 37,321    
Net cash provided by (used in) financing activities of continuing operations 321,731 (73,367) (29,908)
Effect of foreign currency exchange rates on cash and cash equivalents   (80) (282)
Net change in cash, cash equivalents, and restricted cash (24,300) (57,361) (30,549)
Total cash, cash equivalents, and restricted cash, beginning of period 104,997 162,358 192,907
Total cash, cash equivalents, and restricted cash, end of period 80,697 104,997 162,358
Supplemental cash flow information:      
Interest paid 8,231 4,829 4,554
Taxes paid 3,969 6,117 30,411
Dividends declared, not paid 2,672 2,703 2,721
Noncash investing activity:      
Transfer (to) from operating activities to property, plant and equipment   (1,219)  
Purchases of property, plant and equipment included in accounts payable and accrued expenses $ 22,093 $ 21,746 $ 11,668