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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Dec. 31, 2018
Cash flows from operating activities:          
Net income $ 2,027 $ 10,780 $ 2,762 $ 8,477  
Adjustments to reconcile net income to net cash flows provided by operating activities:          
Depreciation and amortization 21,549 21,913 42,267 43,217  
Provision for doubtful accounts     2,736 2,249  
Amortization of debt discount and debt issuance costs     290 393  
Stock-based compensation 2,028 2,103 3,334 3,679  
Deferred income taxes     (4,574) (1,279)  
(Gain) Loss on disposition of long-lived assets (111) (2,333) 191 (2,049)  
Unrealized (gain) loss on foreign currency     (160) 1,066  
Other non-cash activity     11 177  
Changes in operating assets and liabilities, excluding the effects of acquisitions and dispositions:          
Accounts receivable     (14,886) (10,605)  
Materials and supplies, prepayments, and other current assets     (9,130) 1,254  
Prepaid income taxes     5,158    
Accounts payable and accrued liabilities, advance payments and deposits and other current liabilities     10,570 (2,137)  
Accrued taxes     (22,011) 1,249  
Other assets     251 (1,208)  
Other liabilities     1,713 1,554  
Net cash provided by operating activities     18,522 46,037  
Cash flows from investing activities:          
Capital expenditures     (35,273) (40,594)  
Hurricane rebuild capital expenditures     (123) (66,654)  
Hurricane insurance proceeds       34,606  
Receipt of government grants       5,400  
Divestiture of businesses, net of transferred cash of $0.0 and $0.3 million, respectively       926  
Purchase of other investments     (10,000) (2,000)  
Proceeds from sale of assets       4,130  
Purchase of short-term investments     (5,028)    
Proceeds from sale of investments     141 5,348  
Net cash used in investing activities     (50,283) (58,838)  
Cash flows from financing activities:          
Dividends paid on common stock     (5,439) (5,441)  
Distribution to non-controlling interests     (3,878) (12,836)  
Payment of debt issuance costs     (1,340)    
Principal repayments of term loan     (1,887) (4,786)  
Share repurchases       (1,576)  
Stock-based compensation share repurchases     (1,578) (2,084)  
Repurchases of non-controlling interests     (861) (61)  
Investments made by minority shareholders in consolidated affiliates     488    
Net cash used in financing activities     (14,495) (26,784)  
Effect of foreign currency exchange rates on cash and cash equivalents     31 (178)  
Net change in cash, cash equivalents, and restricted cash     (46,225) (39,763)  
Total cash, cash equivalents, and restricted cash, beginning of period     192,907 219,890 $ 219,890
Total cash, cash equivalents, and restricted cash, end of period $ 146,682 $ 180,127 146,682 180,127 $ 192,907
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     $ 6,356 $ 13,266