Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
CASH FLOWS FROM OPERATING ACTIVITIES:
Net loss	$ (11,745)	$ (127,933)
Adjustments to reconcile net loss to net cash provided by operating activities:
Depreciation, accretion, and amortization	183,881	182,579
Loss on remeasurement of U.S. denominated intercompany loans	86,251	230,132
Non-cash compensation expense	20,422	16,278
Non-cash asset impairment and decommission costs	4,791	13,997
Loss from extinguishment of debt	10,652	16,864
Deferred income tax benefit	(26,837)	(72,204)
Other non-cash items reflected in the Statements of Operations	17,413	1,402
Changes in operating assets and liabilities, net of acquisitions:
Accounts receivable and costs and estimated earnings in excess of billings on uncompleted contracts, net	(4,523)	19,712
Prepaid expenses and other assets	3,517	(1,643)
Operating lease right-of-use assets, net	29,865	30,181
Accounts payable and accrued expenses	(4,667)	(4,725)
Accrued interest	(27,347)	(18,197)
Long-term lease liabilities	(26,393)	(24,712)
Other liabilities	30,218	16,011
Net cash provided by operating activities	285,498	277,742
CASH FLOWS FROM INVESTING ACTIVITIES:
Acquisitions	(1,052,676)	(89,531)
Capital expenditures	(24,536)	(39,291)
Purchase of investments	(755,013)	(610,012)
Proceeds from sale of investments	755,000	610,000
Other investing activities	641	(3,178)
Net cash used in investing activities	(1,076,584)	(132,012)
CASH FLOWS FROM FINANCING ACTIVITIES:
Borrowings under Revolving Credit Facility	710,000	500,000
Repayments under Revolving Credit Facility	(500,000)	(505,000)
Proceeds from issuance of Senior Notes, net of fees	1,485,670	988,516
Repayment of Senior Notes	(757,500)	(759,143)
Repurchase and retirement of common stock	(168,923)	(203,330)
Payment of dividends on common stock	(63,412)	(52,201)
Proceeds from employee stock purchase/stock option plans	10,838	38,869
Payments related to taxes on net settlement of stock options and restricted stock units	(8,823)	(44,488)
Other financing activities	(6,507)	(6,558)
Net cash provided by (used in) financing activities	701,343	(43,335)
Effect of exchange rate changes on cash, cash equivalents, and restricted cash	(10,880)	(13,900)
NET CHANGE IN CASH, CASH EQUIVALENTS, AND RESTRICTED CASH	(100,623)	88,495
CASH, CASH EQUIVALENTS, AND RESTRICTED CASH:
Beginning of period	342,808	141,120
End of period	242,185	229,615
Cash paid during the period for:
Interest	118,430	114,033
Income taxes	6,387	5,981
SUPPLEMENTAL CASH FLOW INFORMATION OF NON-CASH ACTIVITIES:
Right-of-use assets obtained in exchange for new operating lease liabilities	11,890	11,250
Operating lease modifications and reassessments	6,181	15,264
Right-of-use assets obtained in exchange for new finance lease liabilities	$ 1,033	$ 893