Fair Value - Assets and Liabilities Measured at Fair Value on a Recurring Basis (Details) - Fair Value, Measurements, Recurring [Member] - USD ($) $ in Thousands | Mar. 31, 2016 | Dec. 31, 2015 |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Cash equivalents | $ 480,942 | $ 419,176 |
Restricted cash | 20,354 | 19,800 |
Assets fair value disclosure | 488,044 | 411,581 |
Heating Oil | Collars | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Total current assets (liabilities) | | (17,895) |
Jet Fuel | Swaps | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Total current assets (liabilities) | | (9,655) |
Energy Related Derivative | Heating Oil | Collars | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Total current assets (liabilities) | (8,739) | |
Energy Related Derivative | Jet Fuel | Swaps | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Total current assets (liabilities) | (3,231) | |
Interest Rate Swap | Swaps | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Total current assets (liabilities) | (1,282) | 155 |
Fair Value, Inputs, Level 1 | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Cash equivalents | 480,942 | 419,176 |
Restricted cash | 20,354 | 19,800 |
Assets fair value disclosure | 501,296 | 438,976 |
Fair Value, Inputs, Level 1 | Heating Oil | Collars | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Total current assets (liabilities) | | 0 |
Fair Value, Inputs, Level 1 | Jet Fuel | Swaps | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Total current assets (liabilities) | | 0 |
Fair Value, Inputs, Level 1 | Energy Related Derivative | Heating Oil | Collars | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Total current assets (liabilities) | 0 | |
Fair Value, Inputs, Level 1 | Energy Related Derivative | Jet Fuel | Swaps | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Total current assets (liabilities) | 0 | |
Fair Value, Inputs, Level 1 | Interest Rate Swap | Swaps | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Total current assets (liabilities) | 0 | 0 |
Fair Value, Inputs, Level 2 | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Cash equivalents | 0 | 0 |
Restricted cash | 0 | 0 |
Assets fair value disclosure | (13,252) | (27,395) |
Fair Value, Inputs, Level 2 | Heating Oil | Collars | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Total current assets (liabilities) | | (17,895) |
Fair Value, Inputs, Level 2 | Jet Fuel | Swaps | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Total current assets (liabilities) | | (9,655) |
Fair Value, Inputs, Level 2 | Energy Related Derivative | Heating Oil | Collars | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Total current assets (liabilities) | (8,739) | |
Fair Value, Inputs, Level 2 | Energy Related Derivative | Jet Fuel | Swaps | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Total current assets (liabilities) | (3,231) | |
Fair Value, Inputs, Level 2 | Interest Rate Swap | Swaps | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Total current assets (liabilities) | | 155 |
Fair Value, Inputs, Level 3 | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Cash equivalents | 0 | 0 |
Restricted cash | 0 | 0 |
Assets fair value disclosure | 0 | 0 |
Fair Value, Inputs, Level 3 | Heating Oil | Collars | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Total current assets (liabilities) | | 0 |
Fair Value, Inputs, Level 3 | Jet Fuel | Swaps | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Total current assets (liabilities) | | 0 |
Fair Value, Inputs, Level 3 | Energy Related Derivative | Heating Oil | Collars | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Total current assets (liabilities) | 0 | |
Fair Value, Inputs, Level 3 | Energy Related Derivative | Jet Fuel | Swaps | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Total current assets (liabilities) | 0 | |
Fair Value, Inputs, Level 3 | Interest Rate Swap | Swaps | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Total current assets (liabilities) | $ 0 | $ 0 |