Consolidated Statements Of Cash Flows - USD ($) shares in Thousands, $ in Thousands		6 Months Ended
		Jun. 30, 2017	Jun. 30, 2016
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income		$ 46,832	$ 86,348
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation, accretion, and amortization		318,551	319,524
Non-cash asset impairment and decommission costs		13,719	17,752
Non-cash compensation expense		19,471	16,677
Amortization of deferred financing fees		11,647	10,590
Loss (gain) on remeasurement of U.S. dollar denominated intercompany loan		6,758	(92,132)
Provision for doubtful accounts	[1]	1,012	17,504
Other non-cash items reflected in the Statements of Operations		497	(648)
Changes in operating assets and liabilities, net of acquisitions:
Accounts receivable and costs and estimated earnings in excess of billings on uncompleted contracts, net		(1,079)	8,769
Prepaid expenses and other assets		(11,075)	(25,842)
Accounts payable and accrued expenses		581	(5,310)
Accrued interest		(2,461)	(924)
Other liabilities		(254)	2,427
Net cash provided by operating activities		404,199	354,735
CASH FLOWS FROM INVESTING ACTIVITIES:
Acquisitions		(82,181)	(148,704)
Capital expenditures		(69,435)	(70,661)
Other investing activities		(17,025)	(10,062)
Net cash used in investing activities		(168,641)	(229,427)
CASH FLOWS FROM FINANCING ACTIVITIES:
Borrowings under Revolving Credit Facility		100,000	140,000
Repayments under Revolving Credit Facility		(340,000)	(110,000)
Repayment of 2012-1C Tower Securities		(610,000)
Proceeds from issuance of Tower Securities, net of fees		750,153
Repurchase and retirement of common stock, inclusive of fees		(144,438)	(150,029)
Other financing activities		20,175	(4,271)
Net cash used in financing activities		(224,110)	(124,300)
Effect of exchange rate changes on cash, cash equivalents, and restricted cash		(225)	15,009
NET CHANGE IN CASH, CASH EQUIVALENTS, AND RESTRICTED CASH		11,223	16,017
CASH, CASH EQUIVALENTS, AND RESTRICTED CASH:
Beginning of period		185,970	146,619
End of period		197,193	162,636
Cash paid during the period for:
Interest		158,569	168,583
Income taxes		$ 8,561	5,861
SUPPLEMENTAL DISCLOSURE OF NON-CASH ACTIVITIES:
Assets acquired through capital leases			$ 1,073
Common stock issued in connection with acquisitions		63,313

[1] Includes the impact of the $16,498 Oi reserve for the six months ended June 30, 2016.