CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Cash flows from operating activities:
Net income (loss)	$ 735	$ (2,303)
Adjustments to reconcile net income to net cash flows provided by operating activities:
Depreciation and amortization	20,718	21,305
Provision for doubtful accounts	1,285	796
Amortization and write off of debt discount and debt issuance costs	160	197
Stock-based compensation	1,301	1,576
Deferred income taxes	(1,914)	(1,089)
Loss on disposition of long-lived assets	302	284
Unrealized (gain) loss on foreign currency	(64)	364
Other non-cash activity	(17)	85
Changes in operating assets and liabilities, excluding the effects of acquisitions and dispositions:
Accounts receivable	(9,102)	(5,061)
Materials and supplies, prepayments, and other current assets	90	3,991
Prepaid income taxes	5,158
Accounts payable and accrued liabilities, advance payments and deposits and other current liabilities	(3,188)	(2,306)
Accrued taxes	1,620	3,292
Other assets	324	(581)
Other liabilities	1,362	1,994
Net cash provided by operating activities	18,770	22,544
Cash flows from investing activities:
Capital expenditures	(17,641)	(21,041)
Hurricane rebuild capital expenditures	(123)	(30,851)
Hurricane insurance proceeds		34,606
Receipt of government grants		5,400
Purchase of other investments	(10,000)
Purchase of short-term investments	(5,000)
Proceeds from sale of investments	141	4,809
Net cash used in investing activities	(32,623)	(7,077)
Cash flows from financing activities:
Dividends paid on common stock	(2,720)	(2,724)
Distribution to non-controlling interests	(1,540)	(12,424)
Principal repayments of term loan	(949)	(938)
Stock-based compensation share repurchases	(1,569)	(2,041)
Repurchases of non-controlling interests	(225)	(3)
Investments made by minority shareholders in consolidated affiliates	488
Net cash used in financing activities	(6,515)	(18,130)
Effect of foreign currency exchange rates on cash and cash equivalents	15	(31)
Net change in cash, cash equivalents, and restricted cash	(20,353)	(2,694)
Total cash, cash equivalents, and restricted cash, beginning of period	192,907	219,890
Total cash, cash equivalents, and restricted cash, end of period	172,554	217,196
Noncash investing activity:
Purchases of property, plant and equipment included in accounts payable and accrued expenses	$ 8,129	$ 20,068