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Acquisition (Tables) | 6 Months Ended
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Jun. 30, 2014
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 Condensed Consolidated Statement of Operations for the periods presented:
| Three Months Ended June 30, 2014 |  | Six Months Ended June 30, 2014
Revenues | $ | 23,591 |  |  | $ | 48,475 |
Net income | $ | 6,293 |  |  | $ | 12,824 |
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 June 30, 2013 |  | Six Months Ended June 30, 2013
Pro forma earnings data: |  |  |
Revenues | $ | 1,085,206 |  |  | $ | 2,115,004 |
Net income | $ | 31,351 |  |  | $ | 57,486 |
Schedule of Disposal Groups, Including Discontinued Operations, Income Statement, Balance Sheet and Additional Disclosures [Table Text Block] | The summarized operating results of our discontinued operations are as follows:
| Three Months Ended June 30, 2013 |  | Six Months Ended June 30, 2013
Revenues | $ | 144,962 |  |  | $ | 277,368 |
Cost and expenses | 144,672 |  |  | 276,936 |
Operating income | 290 |  |  | 432 |
Interest income | — |  |  | 1 |
Income from discontinued operations | $ | 290 |  |  | $ | 433 |

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- Definition Tabular disclosure of pro forma results of operations for a material business acquisition or series of individually immaterial business acquisitions that are material in the aggregate. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(2)-(3) -URI http://asc.fasb.org/extlink&oid=25497992&loc=d3e1392-128463 + Details
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- Definition Tabular disclosure of disposal groups, which may include the gain (loss) recognized in the income statement and the income statement caption that includes that gain (loss), amounts of revenues and pretax profit or loss reported in discontinued operations, the classification and carrying value of the assets and liabilities comprising the disposal group, and the segment in which the disposal group was reported. Also may include the amount of adjustments to amounts previously reported in discontinued operations such as resolution of contingencies arising from the disposal transaction or the operations of the component prior to disposal. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6360339&loc=d3e1361-107760 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6892542&loc=d3e957-107759 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6360339&loc=d3e1510-107760 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=8077374&loc=d3e2443-110228 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6360339&loc=d3e1474-107760 + Details
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