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Supplemental Cash Flow Information (Narrative) (Details) - USD ($) $ in Thousands | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014 | Jul. 25, 2015 | Jul. 24, 2015 | Jul. 23, 2015
Supplemental Cash Flow Elements [Abstract] |  |  |  |  |  |
Payments of interest and commitment fees | $ 157,400 | $ 86,800 | $ 74,800 |  |  |
Capitalized interest | 26,600 | 17,100 | 13,800 |  |  |
Cash paid for income taxes | 1,300 | 900 | 800 |  |  |
Incurred liabilities for fixed and intangible asset additions | 33,700 | 68,600 | 61,200 |  |  |
Liabilities for other asset additions | 700 | 300 | 9,400 |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Gain on basis step up on historical interest | $ 0 | 332,380 | $ 0 |  |  |
SEKCO [Member] |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Equity Method Investment, Ownership Percentage |  |  |  | 50.00% |  |
Enterprise Offshore Acquisition [Member] |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Gain on basis step up on historical interest |  | $ 332,400 |  |  |  |
Enterprise Offshore Acquisition [Member] | CHOPS [Member] |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Equity interest step up acquired percentage |  | 50.00% |  |  | 100.00% | 50.00%
Equity Method Investment, Ownership Percentage |  | 50.00% |  |  | 50.00% | 50.00%
Enterprise Offshore Acquisition [Member] | SEKCO [Member] |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Equity interest step up acquired percentage | 100.00% | 50.00% |  |  | 100.00% | 50.00%
Equity Method Investment, Ownership Percentage |  |  |  |  | 50.00% | 50.00%

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