Consolidated Statements Of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income	$ 37,598	$ 53,639
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation, accretion, and amortization	159,031	159,801
Non-cash asset impairment and decommission costs	7,047	4,196
Non-cash compensation expense	9,277	7,785
Amortization of deferred financing fees	6,698	5,265
Gain on remeasurement of U.S. dollar denominated intercompany loan	(13,659)	(44,765)
Other non-cash items reflected in the Statements of Operations	35	(121)
Changes in operating assets and liabilities, net of acquisitions:
Accounts receivable and costs and estimated earnings in excess of billings on uncompleted contracts, net	1,444	90
Prepaid expenses and other assets	(4,777)	(12,266)
Accounts payable and accrued expenses	(3,899)	(8,277)
Accrued interest	(25,290)	(14,552)
Other liabilities	(1,199)	(6,151)
Net cash provided by operating activities	172,306	144,644
CASH FLOWS FROM INVESTING ACTIVITIES:
Acquisitions	(42,651)	(91,832)
Capital expenditures	(35,747)	(36,060)
Other investing activities	(5,879)	(4,447)
Net cash used in investing activities	(84,277)	(132,339)
CASH FLOWS FROM FINANCING ACTIVITIES:
Borrowings under Revolving Credit Facility		70,000
Repayments under Revolving Credit Facility	(110,000)	(50,000)
Repayment of Term Loans	(5,000)	(5,000)
Repurchase and retirement of common stock, inclusive of fees	(4,419)	(50,012)
Other financing activities	7,147	1,689
Net cash used in financing activities	(112,272)	(33,323)
Effect of exchange rate changes on cash, cash equivalents, and restricted cash	3,744	6,032
NET CHANGE IN CASH, CASH EQUIVALENTS, AND RESTRICTED CASH	(20,499)	(14,986)
CASH, CASH EQUIVALENTS, AND RESTRICTED CASH:
Beginning of period	185,970	146,619
End of period	165,471	131,633
Cash paid during the period for:
Interest	102,875	98,434
Income taxes	$ 2,806	2,359
SUPPLEMENTAL DISCLOSURE OF NON-CASH ACTIVITIES:
Assets acquired through capital leases		$ 273