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Consolidated Statements Of Cash Flows (USD $)
In Thousands, unless otherwise specified
 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
CASH FLOWS FROM OPERATING ACTIVITIES:    
Net loss $ (24,685) $ (36,747)
Adjustments to reconcile net loss to net cash provided by operating activities:    
Depreciation, accretion, and amortization 464,858 400,006
Non-cash interest expense 26,832 39,151
Deferred income tax expense (benefit) (1,043) (2,670)
Non-cash asset impairment and decommission costs 9,909 13,097
Non-cash compensation expense 17,231 13,010
Amortization of deferred financing fees 13,114 11,508
Loss from extinguishment of debt, net 25,080 5,764
Unrealized gain on foreign currency swap contract   (6,893)
Gain on sale of bankruptcy claim on convertible hedge   (27,870)
Other non-cash items reflected in the Statements of Operations 2,323 1,368
Changes in operating assets and liabilities, net of acquisitions:    
Accounts receivable and costs and estimated earnings in excess of billings on uncompleted contracts, net (10,649) (34,531)
Prepaid and other assets (43,923) (68,622)
Accounts payable and accrued expenses (9,750) 2,996
Accrued interest (659) 137
Other liabilities 34,541 33,344
Net cash provided by operating activities 503,179 343,048
CASH FLOWS FROM INVESTING ACTIVITIES:    
Acquisitions (1,048,748) (347,055)
Capital expenditures (131,347) (103,373)
Other investing activities (1,782) 960
Net cash used in investing activities (1,181,877) (449,468)
CASH FLOWS FROM FINANCING ACTIVITIES:    
Borrowings under Revolving Credit Facility 575,000 125,000
Repayments under Revolving Credit Facility (490,000) (225,000)
Repayment of Term Loans (303,000) (509,500)
Proceeds from Term Loans, net of fees 1,483,337  
Payment for the redemption of 8.25% Notes (253,805)  
Proceeds from employee stock purchase/stock option plans 6,294 10,167
Proceeds from 4.875% Senior Notes, net of fees 732,459  
Proceeds from settlement of convertible note hedges 7 182,855
Proceeds from issuance of Tower Securities   1,304,854
Payments for settlement of convertible debt (132,592) (794,997)
Payments for settlement of common stock warrants (602,834) (42,424)
Proceeds from sale of bankruptcy claim on convertible hedge   27,870
Payment for earn-outs (16,346) (1,310)
Other financing activities (8,157) (16,005)
Net cash provided by financing activities 990,363 61,510
Effect of exchange rate changes on cash and cash equivalents 16,480 1,220
NET INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS 328,145 (43,690)
CASH AND CASH EQUIVALENTS:    
Beginning of period 122,112 233,099
End of period 450,257 189,409
Cash paid during the period for:    
Interest 216,103 185,408
Income taxes 6,377 5,208
SUPPLEMENTAL CASH FLOW INFORMATION OF NON-CASH ACTIVITIES:    
Assets acquired through capital leases 1,290 1,239
Issuance of stock for settlement of convertible debt and warrants, net of hedges 284 18,158
Liabilities assumed on acquisition   $ 9,796