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Assets Held-for-Sale and Discontinued Operations (Details) (USD $)
3 Months Ended 9 Months Ended 1 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2013
Sep. 30, 2012
Dec. 31, 2012
Jul. 31, 2013
Oil and gas
Sep. 30, 2013
Oil and gas
Dec. 31, 2012
Oil and gas
Sep. 30, 2013
Rig Services
Apr. 02, 2013
Rig Services
Dec. 31, 2012
Rig Services
Assets held-for-sale                    
Assets held for sale $ 396,201,000 $ 396,201,000   $ 383,857,000   $ 264,710,000 $ 377,625,000 $ 131,491,000   $ 6,232,000
Adjustment to carrying value of assets 14,044,000 14,044,000 46,264,000     34,400,000        
Initial proceeds         90,000,000          
Sale price                 $ 9,300,000