CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Cash flows from operating activities:
Net income (loss)	$ (2,303)	$ 11,584
Adjustments to reconcile net income to net cash flows provided by operating activities:
Depreciation and amortization	21,305	22,494
Provision for doubtful accounts	796	854
Amortization and write off of debt discount and debt issuance costs	197	112
Stock-based compensation	1,576	1,666
Deferred income taxes	(1,089)
Loss on disposition of long-lived assets	284	1,111
Loss on deconsolidation of subsidiary		529
Other non-cash activity	449	375
Changes in operating assets and liabilities, excluding the effects of acquisitions and dispositions:
Accounts receivable	(5,061)	(5,860)
Materials and supplies, prepayments, and other current assets	3,991	(1,789)
Prepaid income taxes		995
Accounts payable and accrued liabilities, advance payments and deposits and other current liabilities	(2,306)	(14,465)
Accrued taxes	3,292	4,341
Other assets	(581)	2,033
Other liabilities	1,994	8,109
Net cash provided by operating activities	22,544	32,089
Cash flows from investing activities:
Capital expenditures	(21,041)	(45,702)
Hurricane rebuild capital expenditures	(30,851)
Hurricane insurance proceeds	34,606
Government grants	5,400
Divestiture of businesses, net of transferred cash of $2.1 million		22,597
Proceeds from sale of investments	4,809	483
Net cash used in investing activities	(7,077)	(22,622)
Cash flows from financing activities:
Dividends paid on common stock	(2,724)	(5,487)
Distribution to non-controlling interests	(12,424)	(2,828)
Principal repayments of term loan	(938)	(4,442)
Purchase of common stock	(2,041)	(2,121)
Repurchases of non-controlling interests	(3)	(819)
Investments made by minority shareholders in consolidated affiliates		69
Net cash used in financing activities	(18,130)	(15,628)
Effect of foreign currency exchange rates on cash and cash equivalents	(31)	207
Net change in cash, cash equivalents, and restricted cash	(2,694)	(5,954)
Total cash, cash equivalents, and restricted cash, beginning of period	219,890	288,358
Total cash, cash equivalents, and restricted cash, end of period	217,196	282,404
Noncash investing activity:
Purchases of property, plant and equipment included in accounts payable and accrued expenses	$ 20,068	$ 14,174