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Fair Value - Assets and Liabilities Measured at Fair Value on a Recurring Basis (Details) (Fair Value, Measurements, Recurring [Member], USD $)
In Thousands, unless otherwise specified
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Mar. 31, 2015
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Dec. 31, 2014
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| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
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| Cash equivalents |
$ 336,065 |
$ 339,211 |
| Restricted cash |
18,775 |
18,775 |
| Assets fair value disclosure |
341,640 |
330,866 |
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Heating Oil | Collars
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| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
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| Total current assets (liabilities) |
(11,768) |
(27,170) |
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Heating Oil | Swaps
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|
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| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
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| Total current assets (liabilities) |
(615) |
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|
Brent Calls | Calls
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|
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| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
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| Total current assets (liabilities) |
(181) |
50 |
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Jet Fuel | Swaps
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| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
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| Total current assets (liabilities) |
(636) |
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Fair Value, Inputs, Level 1
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| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
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| Cash equivalents |
336,065 |
339,211 |
| Restricted cash |
18,775 |
18,775 |
| Assets fair value disclosure |
354,840 |
357,986 |
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Fair Value, Inputs, Level 1 | Heating Oil | Collars
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|
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| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
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| Total current assets (liabilities) |
0 |
0 |
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Fair Value, Inputs, Level 1 | Heating Oil | Swaps
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|
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| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
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| Total current assets (liabilities) |
0 |
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Fair Value, Inputs, Level 1 | Brent Calls | Calls
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|
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| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
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| Total current assets (liabilities) |
0 |
0 |
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Fair Value, Inputs, Level 1 | Jet Fuel | Swaps
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|
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| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
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| Total current assets (liabilities) |
0 |
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Fair Value, Inputs, Level 2
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| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
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| Cash equivalents |
0 |
0 |
| Restricted cash |
0 |
0 |
| Assets fair value disclosure |
(13,200) |
(27,120) |
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Fair Value, Inputs, Level 2 | Heating Oil | Collars
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|
|
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
| Total current assets (liabilities) |
(11,768) |
(27,170) |
|
Fair Value, Inputs, Level 2 | Heating Oil | Swaps
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|
|
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
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| Total current assets (liabilities) |
(615) |
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|
Fair Value, Inputs, Level 2 | Brent Calls | Calls
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|
|
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
| Total current assets (liabilities) |
(181) |
50 |
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Fair Value, Inputs, Level 2 | Jet Fuel | Swaps
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|
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| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
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| Total current assets (liabilities) |
(636) |
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Fair Value, Inputs, Level 3
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| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
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| Cash equivalents |
0 |
0 |
| Restricted cash |
0 |
0 |
| Assets fair value disclosure |
0 |
0 |
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Fair Value, Inputs, Level 3 | Heating Oil | Collars
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|
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| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
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| Total current assets (liabilities) |
0 |
0 |
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Fair Value, Inputs, Level 3 | Heating Oil | Swaps
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|
|
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
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| Total current assets (liabilities) |
0 |
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|
Fair Value, Inputs, Level 3 | Brent Calls | Calls
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|
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| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
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| Total current assets (liabilities) |
0 |
0 |
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Fair Value, Inputs, Level 3 | Jet Fuel | Swaps
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| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
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| Total current assets (liabilities) |
$ 0 |
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