Consolidated Statements of Cash Flows - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
CASH FLOWS FROM OPERATING ACTIVITIES:
Net (loss) income	$ (127,933)	$ 25,989
Adjustments to reconcile net (loss) income to net cash provided by operating activities:
Depreciation, accretion, and amortization	182,579	171,038
Non-cash asset impairment and decommission costs	13,997	5,451
Non-cash compensation expense	16,278	23,414
Amortization of deferred financing fees	5,139	5,061
Loss on remeasurement of U.S. dollar denominated intercompany loans	230,132	2,080
Deferred income tax (benefit) expense	(72,204)	3,470
Other non-cash items reflected in the Statements of Operations	13,127	(2,494)
Changes in operating assets and liabilities, net of acquisitions:
Accounts receivable and costs and estimated earnings in excess of billings on uncompleted contracts, net	19,712	1,931
Prepaid expenses and other assets	(1,643)	(130)
Operating lease right-of-use assets, net	30,181	24,116
Accounts payable and accrued expenses	(4,725)	(5,050)
Accrued interest	(18,197)	(13,663)
Long-term lease liabilities	(24,712)	(19,652)
Other liabilities	16,011	1,104
Net cash provided by operating activities	277,742	222,665
CASH FLOWS FROM INVESTING ACTIVITIES:
Acquisitions	(89,531)	(55,287)
Capital expenditures	(39,291)	(36,374)
Purchase of investments	(610,012)	(150,053)
Proceeds from sale of investments	610,000	150,557
Other investing activities	(3,178)	6,181
Net cash used in investing activities	(132,012)	(84,976)
CASH FLOWS FROM FINANCING ACTIVITIES:
Borrowings under Revolving Credit Facility	500,000
Repayments under Revolving Credit Facility	(505,000)	(215,000)
Proceeds from issuance of Senior Notes, net of fees	988,516
Repayment of Senior Notes	(759,143)
Proceeds from employee stock purchase/stock option plans	38,869	69,690
Payments related to taxes on stock options and restricted stock units	(44,488)	(6,215)
Repurchase and retirement of common stock	(203,330)
Payment of dividends on common stock	(52,201)
Other financing activities	(6,558)	(6,522)
Net cash used in financing activities	(43,335)	(158,047)
Effect of exchange rate changes on cash, cash equivalents, and restricted cash	(13,900)	(14,071)
NET CHANGE IN CASH, CASH EQUIVALENTS, AND RESTRICTED CASH	88,495	(34,429)
CASH, CASH EQUIVALENTS, AND RESTRICTED CASH:
Beginning of period	141,120	178,300
End of period	229,615	143,871
Cash paid during the period for:
Interest	114,033	112,378
Income taxes	5,981	5,593
SUPPLEMENTAL CASH FLOW INFORMATION OF NON-CASH ACTIVITIES:
Right-of-use assets obtained in exchange for new operating lease liabilities	11,250	28,881
Operating lease modifications and reassessments	15,264	(21,063)
Right-of-use assets obtained in exchange for new finance lease liabilities	$ 893	$ 865
Common stock issued in connection with acquisitions		1,680