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Segments and Related Information (Foreign Operations) (Narrative) (Details) - USD ($) $ in Thousands |  |  | 3 Months Ended | 9 Months Ended
--- | --- | --- | --- | ---
Sep. 30, 2015 | Dec. 31, 2014 | Sep. 30, 2015 | Sep. 30, 2014 | Sep. 30, 2015 | Sep. 30, 2014
Segments and Related Information [Line Items] |  |  |  |  |  |
Revenue |  |  | $ 1,111,010 | $ 1,315,488 | $ 3,180,906 | $ 3,380,538
Property and equipment, net | $ 586,993 | $ 623,118 | 586,993 |  | 586,993 |
Intangible assets and goodwill, net | $ 1,283,600 | $ 1,332,800 | 1,283,600 |  | 1,283,600 |
Accounts Receivable, Net, Less Billings in Excess of Costs and Earnings [Member] | Credit Concentration Risk [Member] | Foreign Customers [Member] |  |  |  |  |  |
Segments and Related Information [Line Items] |  |  |  |  |  |
Concentration risk, percentage of total | 16.00% | 20.00% |  |  |  |
United States [Member] |  |  |  |  |  |
Segments and Related Information [Line Items] |  |  |  |  |  |
Revenue |  |  | 1,000,000 | 1,100,000 | 2,700,000 | 2,900,000
Property and equipment, net | $ 482,400 | $ 494,100 | 482,400 |  | 482,400 |
Intangible assets and goodwill, net | 1,100,000 | 1,100,000 | 1,100,000 |  | 1,100,000 |
Foreign Operations [Member] |  |  |  |  |  |
Segments and Related Information [Line Items] |  |  |  |  |  |
Revenue |  |  | 115,200 | $ 219,700 | 451,200 | $ 460,300
Property and equipment, net | 104,600 | 129,000 | 104,600 |  | 104,600 |
Intangible assets and goodwill, net | $ 193,900 | $ 227,700 | $ 193,900 |  | $ 193,900 |

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