Quarterly report pursuant to Section 13 or 15(d)

Basis of Presentation and Accounting Policy Impairments of Long-Lived Assets (Details)

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Basis of Presentation and Accounting Policy Impairments of Long-Lived Assets (Details) - USD ($)
$ in Millions
6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Offshore Support Vessels [Member]    
Asset Impairment Charges $ 6.6  
Aircraft [Member]    
Asset Impairment Charges   $ 3.9