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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Cash flows from operating activities:      
Net income $ 34,872 $ 48,894 $ 24,214
Adjustments to reconcile net income to net cash flows provided by operating activities:      
Depreciation and amortization 85,719 86,934 75,980
Provision for doubtful accounts 5,134 3,993 2,454
Amortization and write off of debt discount and debt issuance costs 763 670 505
Stock-based compensation 6,420 6,977 6,410
Unrealized loss on foreign currency 1,342 (1,209)  
Deferred income taxes (23,242) (13,505) (5,636)
Loss on equity method investments   2,033  
Bargain purchase gain     (7,304)
Loss on damaged assets from Hurricanes   35,443  
Insurance recovery related to hurricane claims   (34,606)  
(Gain) loss on disposition of long-lived assets (26,425) 101 27
Gain on sale of investments   (826)  
Impairment of long-lived assets 0 0 11,425
Pension funding required by Viya acquisition     (22,494)
Loss on deconsolidation of subsidiary   529  
Other non-cash activity 308 424 566
Changes in operating assets and liabilities, excluding the effects of acquisitions and dispositions:      
Accounts receivable (1,682) (4,074) 2,601
Materials and supplies, prepayments, and other current assets 5,924 1,002 (8,410)
Prepaid income taxes 3,147 996  
Accounts payable and accrued liabilities, advance payments and deposits and other current liabilities (7,044) 4,649 6,522
Accrued taxes 29,089 (1,385) 21,547
Other assets (238) 4,102 (12,122)
Other liabilities 1,778 4,583 15,371
Net cash provided by operating activities 115,865 145,725 111,656
Cash flows from investing activities:      
Capital expenditures (105,769) (133,786) (124,282)
Hurricane rebuild capital expenditures (80,152) (8,585)  
Hurricane insurance proceeds 34,606    
Receipt of government grants 5,400    
Purchase of strategic investments (3,000) (18,107) (2,000)
Divestiture of businesses, net of transferred cash of $11.5 million and $2.1 million, respectively 48,270 22,381  
Acquisition of businesses, net of acquired cash of $0.0 million and $12.6 million, respectively   (1,183) (146,395)
Purchases of spectrum licenses and other intangible assets, including deposits   (36,832) (10,860)
Acquisition of non-controlling interest in subsidiary     (7,045)
Purchase of short-term investments (138)   (7,422)
Proceeds from sale of investments 6,564 3,794  
Proceeds from disposition of long-lived assets 6,900   1,424
Net cash used in investing activities (87,319) (172,318) (296,580)
Cash flows from financing activities:      
Dividends paid on common stock (10,866) (19,227) (20,965)
Proceeds from new borrowings   8,571 125,800
Distribution to non-controlling interests (18,780) (6,858) (8,632)
Payment of debt issuance costs   (326) (2,763)
Proceeds from stock option exercises 72 1,030 649
Principal repayments of term loan (9,795) (9,355) (33,564)
Repurchase of common stock (6,198) (12,855) (4,114)
Acquisition of businesses, net of acquired cash of $0.0 million   (1,178)  
Repurchases of non-controlling interests (9,663) (2,025) (3,485)
Investments made by minority shareholders in consolidated affiliates   122 22,408
Net cash used in provided by financing activities (55,230) (42,101) 75,334
Effect of foreign currency exchange rates on cash and cash equivalents (299) 226 (626)
Net change in cash, cash equivalents, and restricted cash (26,983) (68,468) (110,216)
Total cash, cash equivalents, and restricted cash, beginning of period 219,890 288,358 398,574
Total cash, cash equivalents, and restricted cash, end of period 192,907 219,890 288,358
Supplemental cash flow information:      
Interest paid 7,235 7,411 4,451
Taxes paid 12,486 13,685 8,237
Dividends declared, not paid 2,720 2,724 5,487
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 $ 12,877 $ 19,466 $ 16,847