CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017
Cash flows from operating activities:
Net income	$ 8,477	$ 22,494
Adjustments to reconcile net income to net cash flows provided by operating activities:
Depreciation and amortization	43,217	44,747
Provision for doubtful accounts	2,249	1,906
Amortization and write off of debt discount and debt issuance costs	393	279
Stock-based compensation	3,679	3,786
Unrealized loss on foreign currency	1,066
Deferred income taxes	(1,279)	2,379
Loss on equity method investments		2,033
(Gain) loss on disposition of long-lived assets	(2,049)	1,111
Gain on sale of investments		(1,055)
Loss on deconsolidation of subsidiary		529
Other non-cash activity	177	509
Changes in operating assets and liabilities, excluding the effects of acquisitions and dispositions:
Accounts receivable	(10,605)	(6,062)
Materials and supplies, prepayments, and other current assets	1,254	(6,586)
Prepaid income taxes		995
Accounts payable and accrued liabilities, advance payments and deposits and other current liabilities	(2,137)	(3,331)
Accrued taxes	1,249	(7,876)
Other assets	(1,208)	2,887
Other liabilities	1,554	6,722
Net cash provided by operating activities	46,037	65,467
Cash flows from investing activities:
Capital expenditures	(40,594)	(78,559)
Hurricane rebuild capital expenditures	(66,654)
Hurricane insurance proceeds	34,606
Receipt of government grants	5,400
Purchase of strategic investments	(2,000)
Divestiture of businesses, net of transferred cash of $0.0 million and $2.1 million, respectively	926	22,597
Purchases of spectrum licenses and other intangible assets, including deposits		(36,832)
Proceeds from sale of investments	5,348	2,761
Proceeds from sale of assets	4,130
Net cash used in investing activities	(58,838)	(90,033)
Cash flows from financing activities:
Dividends paid on common stock	(5,441)	(10,992)
Proceeds from new borrowings		8,571
Distribution to non-controlling interests	(12,836)	(3,373)
Payment of debt issuance costs		(326)
Proceeds from stock option exercises		274
Principal repayments of term loan	(4,786)	(5,447)
Repurchase of common stock	(3,660)	(2,186)
Acquisition of businesses, net of acquired cash of $0.0 million		(1,178)
Repurchases of non-controlling interests	(61)	(953)
Investments made by minority shareholders in consolidated affiliates		122
Net cash used in provided by financing activities	(26,784)	(15,488)
Effect of foreign currency exchange rates on cash and cash equivalents	(178)	207
Net change in cash, cash equivalents, and restricted cash	(39,763)	(39,847)
Total cash, cash equivalents, and restricted cash, beginning of period	219,890	288,358
Total cash, cash equivalents, and restricted cash, end of period	180,127	248,511
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	$ 13,266	$ 13,107