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Acquisition Acquisition (Tables)
 9 Months Ended
Sep. 30, 2013
Business Combinations [Abstract]  
SelectedFinancialInformation [Table Text Block]
The following table presents selected unaudited financial information of our offshore marine transportation business included in our Unaudited Consolidated Statement of Operations for the periods presented:

 
Three Months Ended September 30, 2013
 
Nine Months Ended September 30, 2013
 
 
 
 
Revenues
$
8,651

 
$
8,651

Net Income
$
2,520

 
$
2,520
Business Acquisition, Pro Forma Information [Table Text Block]
The table below presents selected unaudited pro forma financial information incorporating the historical results of our offshore marine transportation business. The pro forma financial information below has been prepared as if the acquisition had been completed on January 1, 2012 and is based upon assumptions deemed appropriate by us and may not be indicative of actual results. Depreciation expense for the fixed assets acquired is calculated on a straight-line basis over an estimated useful life of approximately 25 years.

 
Three Months Ended
September 30,
 
Nine Months Ended
September 30,
 
2013
 
2012
 
2013
 
2012
Pro forma earnings data:
 
 
 
 
 
 
 
Revenues
$
1,271,201

 
$
1,054,689

 
$
3,663,574

 
$
3,050,864

Net Income
$
23,119

 
$
32,812

 
$
81,067

 
$
69,272