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Acquisitions (Details) - USD ($)
$ / shares in Units, $ in Thousands
6 Months Ended
May. 24, 2015
Jun. 30, 2015
Jun. 30, 2014
May. 23, 2015
Dec. 31, 2014
Assets:          
Goodwill   $ 139,756     $ 173,928
Liabilities:          
Accured liabilities   22,278     $ 22,278
Joint Venture in Saudi Arabia          
Acquisitions          
Ownership percentage       51.00%  
Carrying value of equity method investment       $ 44,700  
Excess of fair value over carrying value of long-lived assets   2,300      
Joint Venture in Saudi Arabia          
Acquisitions          
Cash paid for acquisitions of businesses $ 106,000        
Ownership percentage 49.00%        
Assets:          
Cash $ 48,058        
Accounts receivable 153,819        
Other current assets 244,869        
Property,plant and equipment, net 93,000        
Intangible assets 12,400        
Goodwill 58,663        
Other long-term assets 287,138        
Total assets 897,947        
Liabilities:          
Accounts payable 206,599        
Accured liabilities 236,700        
Income taxes payable 8,500        
Other long-term liabilities 293,167        
Total liabilities 744,966        
Net assets acquired $ 152,981        
Business Acquisition, Pro Forma Information [Abstract]          
Total revenues and other income   2,456,115 $ 3,360,645    
Income (loss) from continuing operations,net of tax   $ 75,292 $ 115,844    
Income (loss) from continuing operations per share - basic   $ 0.26 $ 0.38    
Income (loss) from continuing operations per share - diluted   $ 0.26 $ 0.37