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Segment Information - By Geographic Area (Details) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2016 USD ($) | Sep. 30, 2016 USD ($) | Jun. 30, 2016 USD ($) | Mar. 31, 2016 USD ($) | Dec. 31, 2015 USD ($) | Sep. 30, 2015 USD ($) | Jun. 30, 2015 USD ($) | Mar. 31, 2015 USD ($) | Dec. 31, 2016 USD ($) customer | Dec. 31, 2015 USD ($) customer | Dec. 31, 2014 USD ($)
Financial information with respect to entity's operations by geographic area |  |  |  |  |  |  |  |  |  |  |
Operating revenues | $ 538,948 | $ 519,729 | $ 571,591 | $ 597,571 | $ 738,872 | $ 847,553 | $ 863,305 | $ 1,414,707 | $ 2,227,839 | $ 3,864,437 | $ 6,804,197
Property, Plant and Equipment, Net | 6,267,583 |  |  |  | 7,027,802 |  |  |  | 6,267,583 | 7,027,802 | 8,599,125
Goodwill | 166,917 |  |  |  | 166,659 |  |  |  | $ 166,917 | $ 166,659 | 173,928
Sales Revenue, Net [Member] | Customer Concentration Risk [Member] | One customer |  |  |  |  |  |  |  |  |  |  |
Financial information with respect to entity's operations by geographic area |  |  |  |  |  |  |  |  |  |  |
Number of customers | customer |  |  |  |  |  |  |  |  | 1 | 1 |
Percentage |  |  |  |  |  |  |  |  | 33.00% | 12.00% |
United States |  |  |  |  |  |  |  |  |  |  |
Financial information with respect to entity's operations by geographic area |  |  |  |  |  |  |  |  |  |  |
Operating revenues |  |  |  |  |  |  |  |  | $ 642,835 | $ 1,823,906 | 4,701,122
Property, Plant and Equipment, Net | 3,048,749 |  |  |  | 3,703,533 |  |  |  | 3,048,749 | 3,703,533 | 5,205,296
Goodwill | 54,199 |  |  |  | 54,198 |  |  |  | 54,199 | 54,198 | 146,310
Outside the U.S |  |  |  |  |  |  |  |  |  |  |
Financial information with respect to entity's operations by geographic area |  |  |  |  |  |  |  |  |  |  |
Operating revenues |  |  |  |  |  |  |  |  | 1,585,004 | 2,040,531 | 2,103,075
Property, Plant and Equipment, Net | 3,218,834 |  |  |  | 3,324,269 |  |  |  | 3,218,834 | 3,324,269 | 3,393,829
Goodwill | $ 112,718 |  |  |  | $ 112,461 |  |  |  | $ 112,718 | $ 112,461 | $ 27,618

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