Basis of Presentation and Accounting Policies Revenue Recognition (Details)
$ in Millions
Sep. 30, 2016
|Offshore Marine Services [Member]|
|Deferred Revenue||$ 6.8|
Amount of deferred revenue as of balance sheet date. Deferred revenue represents collections of cash or other assets related to a revenue producing activity for which revenue has not yet been recognized. Generally, an entity records deferred revenue when it receives consideration from a customer before achieving certain criteria that must be met for revenue to be recognized in conformity with GAAP.
Reference 1: http://www.xbrl.org/2003/role/presentationRef