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Acquisitions (Schedule of Purchase Price Allocation) (Details) - USD ($) $ in Thousands | Jul. 24, 2015 | Nov. 13, 2014
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Enterprise Offshore Acquisition [Member] |  |
Business Acquisition [Line Items] |  |
Cash | $ 1,270 |
Accounts receivable | 29,768 |
Inventories | 600 |
Other current assets | 10,432 |
Fixed assets | 1,225,685 |
Intangible assets | 79,050 |
Equity investees | 352,535 |
Other assets | 1,966 |
Accounts payable | (6,110) |
Accrued liabilities | (18,662) |
Other long-term liabilities | (161,412) |
Noncontrolling interest | 6,447 |
Total purchase price | $ 1,521,569 |
M/T American Phoenix Acquisition [Member] |  |
Business Acquisition [Line Items] |  |
Fixed assets |  | $ 125,000
Intangible assets |  | 32,000
Total purchase price |  | $ 157,000

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