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Financial Derivative Instruments and Risk Management - Fair Value of Derivative Assets and Liabilities (Details) (USD $)
In Thousands, unless otherwise specified
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Mar. 31, 2015
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Dec. 31, 2014
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| Derivatives, Fair Value [Line Items] |
|
|
| Derivative assets |
$ 0 |
$ 0 |
| Derivative instrument liability |
(13,200) |
(27,120) |
| Designated as Hedging Instrument | Energy Related Derivative |
|
|
| Derivatives, Fair Value [Line Items] |
|
|
| Total current assets (liabilities) |
(10,456) |
(24,846) |
| Designated as Hedging Instrument | Current Liabilities | Energy Related Derivative | Heating Oil | Collars |
|
|
| Derivatives, Fair Value [Line Items] |
|
|
| Derivative instrument liability |
(9,296) |
(24,762) |
| Designated as Hedging Instrument | Current Liabilities | Energy Related Derivative | Heating Oil | Swaps |
|
|
| Derivatives, Fair Value [Line Items] |
|
|
| Derivative instrument liability |
(524) |
0 |
| Designated as Hedging Instrument | Current Liabilities | Energy Related Derivative | Brent Calls | Calls |
|
|
| Derivatives, Fair Value [Line Items] |
|
|
| Derivative instrument liability |
0 |
(84) |
| Designated as Hedging Instrument | Current Liabilities | Energy Related Derivative | Jet Fuel | Swaps |
|
|
| Derivatives, Fair Value [Line Items] |
|
|
| Derivative instrument liability |
(636) |
0 |
| Not Designated as Hedging Instrument | Energy Related Derivative |
|
|
| Derivatives, Fair Value [Line Items] |
|
|
| Total current assets (liabilities) |
(2,744) |
(2,274) |
| Not Designated as Hedging Instrument | Current Liabilities | Energy Related Derivative | Heating Oil | Collars |
|
|
| Derivatives, Fair Value [Line Items] |
|
|
| Derivative instrument liability |
(2,472) |
(2,408) |
| Not Designated as Hedging Instrument | Current Liabilities | Energy Related Derivative | Heating Oil | Swaps |
|
|
| Derivatives, Fair Value [Line Items] |
|
|
| Derivative instrument liability |
(91) |
0 |
| Not Designated as Hedging Instrument | Current Liabilities | Energy Related Derivative | Brent Calls | Calls |
|
|
| Derivatives, Fair Value [Line Items] |
|
|
| Derivative instrument liability |
$ (181) |
$ 134 |